# Shared Flashcard Set

Waves and Stuff
Waves and Stuff
24
Physics
09/25/2012

## Additional Physics Flashcards

Term
 What are waves? (In general, 3 points)
Definition
 - traveling "disturbance"- carry energy from place to place- create no "bulk flow" outward from sources
Term
 Mechanical waves
Definition
 Require a medium in order to travel
Term
 Medium
Definition
 Substance that transmits waves via vibrations of its particles
Term
 Examples of Mechanical Waves
Definition
 Sound, seismic, water wave, wave on string
Term
 Electromagnetic waves
Definition
 Dont require a medium to travel
Term
 Examples of Electromagnetic waves
Definition
 light, radio, microwaves, infrared
Term
 Transverse waves
Definition
 (squiggly) medium travels perpendicular to the waveParts: Crest, wavelength, trough, amplitude
Term
 Longitudinal waves
Definition
 (slinky/spring type) medium travels perpendicular to the wave's directionParts: compression rarefaction, wavelength
Term
 Frequency (F)
Definition
 number of waves, or, cycles, per unit of timeUnits used is Hz
Term
 Period (T)
Definition
 time required for one wave to pass, or, travel one wavelength
Term
 Velocity (V)
Definition
 distance over time
Term
 Sound waves (3 points)
Definition
 Mechanical, Longitudinal, created by a vibrating object
Term
 Pitch
Definition
 Perceived highness/lowness of a sound
Term
 What does the speed of sound rely on?
Definition
 The medium it travels through as well as temperature(Transmission of sound relies on the touching/colliding of molecules)
Term
 How fast does a wave travel at room temp?
Definition
 345 m/s
Term
 Sounds travel fastest through what type of medium?
Definition
 Solids (because the molecules are always touching each other)
Term
 Power (W)
Definition
 Amount of energy a wave carries (W)[Determined by amplitude, therefore, affects volume)
Term
 Intensity (I)
Definition
 Sound power that passes through an area
Term
 What does sound do as it spreads out from the source?
Definition
 It goes through a larger areaIntensity DECREASES as distance increases (inverse relationship)
Term
 Area of a sphere?
Definition
 4 (pi) R(sq)
Term
 What shape forms if a sound is emitted in all directions?
Definition
 A sphere
Term
 Faintest sound humans can hear is what?
Definition
 1.00 x 10(-12) W/m(2)Also known as the threshold of hearing
Term
 Relative Intensity
Definition
 measured in dB and relates to the threshold of hearing. AKA, intensity level
Term
 Doppler Effect
Definition
 change in frequency perceived by someone caused by the relative movement of the sound source
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