Term
Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by:
1)conduction
2)melting
3)condensation
4)evaporation |
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Definition
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Term
Evaporation is a cooling process and condensation is a ____
1) cooling process also
2) warming process
3) neither |
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Definition
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Term
Evaporation is a cooling process because
1) the more energetic molecules are able to escape the liquid
2)the temperature of the remain liquid decreases
3) of conduction and convection
4) heat is radiation during the process
5) none of these |
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Definition
| the more energetic molecules are able to escape the liquid |
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Term
A dog pants
1) for no reason
2) to bring oxygen in lungs
3) to help evaporation occur in its own mouth and bronchial tract
4) to impress the opposite sex |
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Definition
| to help evaporation occur in its own mouth and bronchial tract |
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Term
The source of all wave motion is a
1) harmonic object
2) region of variable high and low pressure
3) vibrating object
4) wave pattern
5) none of these |
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Definition
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Term
Unlike a transverse wave, a longitudinal wave has
1) no amplitude
2) no wavelength
3) no frequency
4) no speed
5) Has all listed. |
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Definition
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Term
Which of the following is not a transverse wave?
1) light
2) sound
3) radio
4) none of them
5) all of them |
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Definition
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Term
The frequency of a simple pendulum depends on
1) its length
2) the acceleration due to gravity
3) its mass
4) all of these
5) two of these |
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Definition
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Term
if the frequency of a certain wave is 10 hertz, its period is
1) 0.1 seconds
2) 10 seconds
3) 100 seconds
4) none of these |
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Definition
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Term
A weight or mass on the end of a spring bobs up and down one cycle every two seconds. Its frequency is
1) 0.5 hertz
2) 2 hertz
3) neither of these |
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Definition
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Term
The source of every sound is something that is
1) undergoing simple harmonic motion
2) vibrating
3) a net emitter of energy
4) moving
5) accelerating |
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Definition
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Term
Double the frequency of a sound and you halve its
1) wavelength
2) amplitude
3) speed
4) all of these
5) none of these |
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Definition
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Term
We are best at hearing
1) infrasonic sound
2) ultrasonic sound
3) both of these
4) neither of these |
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Definition
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Term
sound travels faster in
1) water
2) steel
3) a vacuum
4) air
5) travels about the same speed in all of these |
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Definition
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Term
Sound travels faster in air if the air
1) cold
2) neither cold nor warm
3) warm |
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Definition
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Term
The explanation for refraction must involve a change in
1) speed
2) wavelength
3) frequency
4) all of these
5) none of these |
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Definition
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Term
Which force binds atoms together to form molecules?
1) nuclear
2) gravitational
3) electrical
4) centripetal
5) none of these |
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Definition
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Term
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
1) electrons that surround the nucleus
2) neutrons in the nucleus
3) both of these
4) none of these |
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Definition
| electrons that surround the nucleus |
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Term
A positive ion has more
1) neutrons than protons
2) electrons than protons
3) electrons than neutrons
4) protons than neutrons
5) protons than electrons |
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Definition
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Term
To say that electric charge is quantized is to say that charge of an object
1) is a whole number multiple of the charge of one electron
2) will interact with neighboring electric charges
3) can be neither created nor destroyed
4) may occur in an infinite variety quantities. |
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Definition
| is a whole number multiple of the charge of one electron |
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Term
The unit of electric charge, the coulomb, is the charge on
1) one electron
2) a specific large number of electrons |
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Definition
| a specific large number of electrons |
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Term
A main difference between gravitational and electric forces is that electrical forces
1) are weaker
2) act over shorter distances
3) repel or attack
4) obey the inverse-square law
5) attract |
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Definition
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Term
A transistor is an example of
1) a superconductor
2) a dry cell
3) a resistor
4) electrostatic shielding
5) a semiconductor |
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Definition
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Term
The primary purpose of a lightning rod is to
1) discharge the structure to which its attached
2) attract lightning and guide it towards the ground
3) cancel the electric field within the structure to which it is attached
4) induce within the structure to which it is attached a charge opposite to that of charged clouds overhead. |
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Definition
| discharge the structure to which its attached |
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Term
A balloon will stick to a wooden wall if the balloon is charged
1) positively
2) negatively
3) either way
4) neither way |
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Definition
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Term
Electrons are made to flow in a wire when there is
1) a potential difference across its ends
2) an imbalance of charges in the wire
3) more potential energy at one end of the wire than the other |
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Definition
| a potential difference across its ends |
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Term
A wire that carries an electric current
1) is never electrically charged
2) is electrically charged
3) may be electrically charged |
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Definition
| may be electrically charged |
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Term
A coulomb of charge that passes through a 6-volt battery is given
1) 6 joules
2) 6 newtons
3) 6 watts
4) 6 amperes
5) 6 ohms |
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Definition
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Term
moving electric charges will interact with
1) a magnetic field
2) an electrical field
3) both of these
4) none of these |
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Definition
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Term
An iron rod becomes magnetic when
1) positive ions accumulate at one end and negative ions at the other end.
2) its atoms are aligned having plus charges on one side and negative of the other
3) its electrons stop moving and point in the same direction
4) the net spins of its electrons are in the same direction
5) none of these |
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Definition
| the net spins of its electrons are in the same direction |
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Term
| Evaporation is a change of phase from a |
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Definition
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Term
| Name difference between boiling and evaporation |
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Definition
Boiling occurs at only one temperature value. And occurs everywhere throughout the liquid
Evaporation occurs at the surface of a liquid and at any temperature. |
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Term
| Evaporation is ____ process |
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Definition
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Term
| Sublimation is the change of phase from the |
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Definition
| solid phase to the gas phase, without going through the liquid phase. |
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Term
| Condensation is a change of phase from |
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Definition
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Term
| Condensation is a ____ process |
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Definition
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Term
| Condensation is more likely to occur in cool air because |
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Definition
| the slow-moving air molecules are the ones most likely to stick together and form droplets of water. |
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Term
| Difference between clouds and fog is |
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Definition
|
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Term
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Definition
| condensation occurring at ground level. |
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Term
| Boiling is a change of phase from |
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Definition
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Term
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Definition
|
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Term
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Definition
| periodically erupting pressure cookers. Boiling begins at the bottom and rising bubbles push the water above and eruption begins. |
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Term
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Definition
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Term
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Definition
| a liquid to a solid resulting from heat energy extraction |
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Term
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Definition
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Term
| One can sometimes touch a hot object with a wet finger because |
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Definition
| the heat energy transferred goes into vaporizing the water on your finger rather than burning your skin |
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Term
| The frequency of a sound wave is equal to |
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Definition
| the frequency of the vibrating source that is producing the sound |
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Term
| A young person can hear sounds of frequencies between |
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Definition
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Term
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Definition
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Term
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Definition
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Term
| What can transmit sound waves? |
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Definition
| solids, liquids, gas, or plasmas |
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Term
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Definition
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Term
| speed of sound if 4 higher in |
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Definition
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Term
The speed of sound in air depends on
1) temperature
2) wind conditions
3) humidity
4) all of these
5) none of these |
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Definition
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Term
the speed of sound in air does not depend on
1) loudness
2) frequency
3) none of these
4) both of these |
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Definition
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Term
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Definition
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Term
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Definition
| the bending in the direction of travel of a sound wave |
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Term
| Low frequencies sounds travel |
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Definition
| farther than their counterpart |
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Term
| High frequencies sounds travel |
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Definition
| less than their counterpart |
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Term
| When the frequency of forced vibrations on an object matches an object's natural frequency, the object responds with |
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Definition
| an increase in its amplitude of vibration |
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Term
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Definition
| fluctuations in loudness made when two sound waves of slightly different frequencies interfere |
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Term
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Definition
| the number of beats heard in one second minus the other frequency |
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Term
| An object having unequal numbers of electrons and protons is |
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Definition
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Term
| charges with the same sign |
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Definition
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Term
| charges with different signs |
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Definition
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Term
| Conductors are materials that have |
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Definition
| loose electrons that flow easily when an electric force acts on them |
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Term
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Definition
| without loose electrons so that electrons do not easily flow through them |
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Term
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Definition
| are materials for which the electrical resistance is zero. Effected by low temperatures. |
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Term
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Definition
| are materials that can be made to behave like insulators in low temperatures and conductors in room temperature or higher. |
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Term
| To control the conductivity of the semiconductor you can use |
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Definition
| "doping" to it's "impurity atoms" to remove or add electrons from the crystal structure |
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Term
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Definition
| one object being pushed against another and repelling the opposites equal charges. |
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Term
| A positive charge generates an electric field that is directed |
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Definition
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Term
| A negative charge generates an electric field that is directed |
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Definition
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Term
| The electric field generated by a charge |
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Definition
| decreases with distance as you move away from the charge. |
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Term
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Definition
| the time it takes a pendulum to swing back and forth. |
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Term
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Definition
| wavelength times frequency |
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Term
| An example of a longitudinal wave is |
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Definition
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Term
| Constructive interference |
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Definition
| when the crest of one wave overlaps the crest of another wave. |
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Term
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Definition
| When the crest of one wave overlaps the trough of another wave |
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Term
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Definition
| are waves from the right and left traveling in equal amplitude and wavelength. |
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Term
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Definition
|
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Term
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Definition
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Term
| source and receiver approach from each other |
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Definition
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Term
| source and receiver recede from each other |
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Definition
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Term
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Definition
| energy transferred by the actual movement of a fluid |
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Term
| Heat energy transfer by means of |
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Definition
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Term
| Any object with a temperature on its surface emits |
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Definition
| electromagnetic radiation of various frequencies |
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Term
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Definition
| transparent to the higher frequency solar radiation but opaque to the much lower terrestrial radiation |
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Term
| A good absorber is also a |
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Definition
|
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Term
| if something emits more than it absorbs then it is a net emitter and its temperature |
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Definition
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Term
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Definition
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Term
| light-colored buildings are |
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Definition
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Term
| the rate of cooling of a hot object is |
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Definition
| proportional to the difference in temperature between the hot object and its surroundings |
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Term
| Glass walls are silvered to |
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Definition
| reflect heat waves and the vacuum prevents heat loss due to conduction |
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