# Shared Flashcard Set

## Details

Physics 110 Exam 2 Questions
Chapters 17, 19, 20, 22
94
Physics
03/14/2012

Term
 Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by:1)conduction2)melting3)condensation4)evaporation
Definition
 evaporation
Term
 Evaporation is a cooling process and condensation is a ____1) cooling process also2) warming process3) neither
Definition
 warming process
Term
 Evaporation is a cooling process because1) the more energetic molecules are able to escape the liquid2)the temperature of the remain liquid decreases3) of conduction and convection4) heat is radiation during the process5) none of these
Definition
 the more energetic molecules are able to escape the liquid
Term
 A dog pants1) for no reason2) to bring oxygen in lungs3) to help evaporation occur in its own mouth and bronchial tract4) to impress the opposite sex
Definition
 to help evaporation occur in its own mouth and bronchial tract
Term
 The source of all wave motion is a 1) harmonic object2) region of variable high and low pressure3) vibrating object4) wave pattern5) none of these
Definition
 vibrating object
Term
 Unlike a transverse wave, a longitudinal wave has1) no amplitude2) no wavelength3) no frequency4) no speed5) Has all listed.
Definition
 Has all listed
Term
 Which of the following is not a transverse wave?1) light 2) sound3) radio4) none of them5) all of them
Definition
 sound
Term
 The frequency of a simple pendulum depends on 1) its length2) the acceleration due to gravity3) its mass4) all of these5) two of these
Definition
 two of these
Term
 if the frequency of a certain wave is 10 hertz, its period is1) 0.1 seconds2) 10 seconds3) 100 seconds4) none of these
Definition
 0.1 seconds
Term
 A weight or mass on the end of a spring bobs up and down one cycle every two seconds. Its frequency is1) 0.5 hertz2) 2 hertz3) neither of these
Definition
 0.5 hertz
Term
 The source of every sound is something that is 1) undergoing simple harmonic motion2) vibrating3) a net emitter of energy4) moving 5) accelerating
Definition
 vibrating
Term
 Double the frequency of a sound and you halve its1) wavelength2) amplitude3) speed4) all of these5) none of these
Definition
 wavelength
Term
 We are best at hearing1) infrasonic sound2) ultrasonic sound3) both of these4) neither of these
Definition
 neither of these
Term
 sound travels faster in 1) water2) steel3) a vacuum4) air5) travels about the same speed in all of these
Definition
 steel
Term
 Sound travels faster in air if the air1) cold2) neither cold nor warm3) warm
Definition
 warm
Term
 The explanation for refraction must involve a change in 1) speed2) wavelength3) frequency4) all of these5) none of these
Definition
 speed
Term
 Which force binds atoms together to form molecules?1) nuclear2) gravitational3) electrical 4) centripetal5) none of these
Definition
 electrical
Term
 In an electrically neutral atom the number of protons in the nucleus is equal to the number of 1) electrons that surround the nucleus2) neutrons in the nucleus3) both of these4) none of these
Definition
 electrons that surround the nucleus
Term
 A positive ion has more1) neutrons than protons2) electrons than protons3) electrons than neutrons4) protons than neutrons 5) protons than electrons
Definition
 protons than electrons
Term
 To say that electric charge is quantized is to say that charge of an object1) is a whole number multiple of the charge of one electron2) will interact with neighboring electric charges 3) can be neither created nor destroyed4) may occur in an infinite variety quantities.
Definition
 is a whole number multiple of the charge of one electron
Term
 The unit of electric charge, the coulomb, is the charge on 1) one electron 2) a specific large number of electrons
Definition
 a specific large number of electrons
Term
 A main difference between gravitational and electric forces is that electrical forces 1) are weaker2) act over shorter distances3) repel or attack4) obey the inverse-square law5) attract
Definition
 repel or attract
Term
 A transistor is an example of 1) a superconductor2) a dry cell3) a resistor 4) electrostatic shielding5) a semiconductor
Definition
 a semiconductor
Term
 The primary purpose of a lightning rod is to 1) discharge the structure to which its attached2) attract lightning and guide it towards the ground3) cancel the electric field within the structure to which it is attached4) induce within the structure to which it is attached a charge opposite to that of charged clouds overhead.
Definition
 discharge the structure to which its attached
Term
 A balloon will stick to a wooden wall if the balloon is charged1) positively 2) negatively 3) either way4) neither way
Definition
 either way
Term
 Electrons are made to flow in a wire when there is 1) a potential difference across its ends2) an imbalance of charges in the wire3) more potential energy at one end of the wire than the other
Definition
 a potential difference across its ends
Term
 A wire that carries an electric current1) is never electrically charged2) is electrically charged3) may be electrically charged
Definition
 may be electrically charged
Term
 A coulomb of charge that passes through a 6-volt battery is given 1) 6 joules2) 6 newtons3) 6 watts4) 6 amperes5) 6 ohms
Definition
 6 joules
Term
 moving electric charges will interact with 1) a magnetic field2) an electrical field3) both of these4) none of these
Definition
 both of these
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
Definition
 the net spins of its electrons are in the same direction
Term
 Evaporation is a change of phase from a
Definition
 liquid to a gas
Term
 Name difference between boiling and evaporation
Definition
 Boiling occurs at only one temperature value. And occurs everywhere throughout the liquidEvaporation occurs at the surface of a liquid and at any temperature.
Term
 Evaporation is ____ process
Definition
 cooling
Term
 Sublimation is the change of phase from the
Definition
 solid phase to the gas phase, without going through the liquid phase.
Term
 Condensation is a change of phase from
Definition
 a gas to a liquid
Term
 Condensation is a ____ process
Definition
 warming process
Term
 Condensation is more likely to occur in cool air because
Definition
 the slow-moving air molecules are the ones most likely to stick together and form droplets of water.
Term
 Difference between clouds and fog is
Definition
 altitude
Term
 Fog results from
Definition
 condensation occurring at ground level.
Term
 Boiling is a change of phase from
Definition
 liquid to a gas
Term
 Boiling occurs at
Definition
 100 celcius
Term
 Geysers are
Definition
 periodically erupting pressure cookers. Boiling begins at the bottom and rising bubbles push the water above and eruption begins.
Term
 Melting is
Definition
 a solid to a liquid
Term
 Freezing is
Definition
 a liquid to a solid resulting from heat energy extraction
Term
 Regelation
Definition
 melting under pressure
Term
 One can sometimes touch a hot object with a wet finger because
Definition
 the heat energy transferred goes into vaporizing the water on your finger rather than burning your skin
Term
 The frequency of a sound wave is equal to
Definition
 the frequency of the vibrating source that is producing the sound
Term
 A young person can hear sounds of frequencies between
Definition
 20 Hz to 20,000 Hz
Term
 infrasonic waves
Definition
 less than 20 hz
Term
 ultrasonic waves
Definition
 greater than 20,000 Hz
Term
 What can transmit sound waves?
Definition
 solids, liquids, gas, or plasmas
Term
 sound does not travel in
Definition
 vacuum
Term
 speed of sound if 4 higher in
Definition
 water
Term
 The speed of sound in air depends on 1) temperature2) wind conditions3) humidity4) all of these5) none of these
Definition
 all of these
Term
 the speed of sound in air does not depend on 1) loudness2) frequency 3) none of these4) both of these
Definition
 both of these
Term
 An echo is a
Definition
 reflected sound wave
Term
 refraction is
Definition
 the bending in the direction of travel of a sound wave
Term
 Low frequencies sounds travel
Definition
 farther than their counterpart
Term
 High frequencies sounds travel
Definition
 less than their counterpart
Term
 When the frequency of forced vibrations on an object matches an object's natural frequency, the object responds with
Definition
 an increase in its amplitude of vibration
Term
 Beats are
Definition
 fluctuations in loudness made when two sound waves of slightly different frequencies interfere
Term
 Beat frequency
Definition
 the number of beats heard in one second minus the other frequency
Term
 An object having unequal numbers of electrons and protons is
Definition
 electrically charged
Term
 charges with the same sign
Definition
 repel
Term
 charges with different signs
Definition
 attract
Term
 Conductors are materials that have
Definition
 loose electrons that flow easily when an electric force acts on them
Term
 Insulators are materials
Definition
 without loose electrons so that electrons do not easily flow through them
Term
 Superconductors
Definition
 are materials for which the electrical resistance is zero. Effected by low temperatures.
Term
 Semiconductors
Definition
 are materials that can be made to behave like insulators in low temperatures and conductors in room temperature or higher.
Term
 To control the conductivity of the semiconductor you can use
Definition
 "doping" to it's "impurity atoms" to remove or add electrons from the crystal structure
Term
 Charge polarization is
Definition
 one object being pushed against another and repelling the opposites equal charges.
Term
 A positive charge generates an electric field that is directed
Definition
 away from the charge
Term
 A negative charge generates an electric field that is directed
Definition
 towards the charge
Term
 The electric field generated by a charge
Definition
 decreases with distance as you move away from the charge.
Term
 A period is
Definition
 the time it takes a pendulum to swing back and forth.
Term
 wave speed is equal to
Definition
 wavelength times frequency
Term
 An example of a longitudinal wave is
Definition
 sound
Term
 Constructive interference
Definition
 when the crest of one wave overlaps the crest of another wave.
Term
 Destructive Interference
Definition
 When the crest of one wave overlaps the trough of another wave
Term
 Standing waves
Definition
 are waves from the right and left traveling in equal amplitude and wavelength.
Term
 Anti-node is
Definition
 Max distrubtion
Term
 node is
Definition
 zero distrubion
Term
 source and receiver approach from each other
Definition
 increase in frequency
Term
 source and receiver recede from each other
Definition
 decrease frequency
Term
 Convection
Definition
 energy transferred by the actual movement of a fluid
Term
 Heat energy transfer by means of
Definition
 electromagnetic waves
Term
 Any object with a temperature on its surface emits
Definition
Term
 The atmosphere is
Definition
 transparent to the higher frequency solar radiation but opaque to the much lower terrestrial radiation
Term
 A good absorber is also a
Definition
 good emitter
Term
 if something emits more than it absorbs then it is a net emitter and its temperature
Definition
 drops
Term
 good reflectors are
Definition
 poor absorbers
Term
 light-colored buildings are
Definition
 good reflectors
Term
 the rate of cooling of a hot object is
Definition
 proportional to the difference in temperature between the hot object and its surroundings
Term
 Glass walls are silvered to
Definition
 reflect heat waves and the vacuum prevents heat loss due to conduction
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