# Shared Flashcard Set

## Details

Science Test tomorrow....
32
Education
03/15/2011

Term
 What is the amplitude of a wave?
Definition
 height of the wave
Term
 What about a sound wave does amplitude change?
Definition
 loudness
Term
 What is the wavelength of a wave?
Definition
 crest to crest/ trough to trough
Term
 If you increase the wavelength of a wave, what else does that change about the wave?
Definition
 lower frequency
Term
 What characteristics of a sound wave does wavelength affect?
Definition
 pitch
Term
 A low point of a wave is called a _____
Definition
 trough
Term
 A crest is the _____ of a wave.
Definition
 top
Term
 When the particles of the medium move back and forth along the direction of the wave motion, the wave is a ______ ______
Definition
 longitudinal wave
Term
 When the particles of a medium are far apart, that part of the wave is called a ______
Definition
 rarefaction
Term
 Compression is the part of the medium where particles are _____
Definition
 compressed
Term
 A wave in which the particles of the medium move at right angles to the direction in which the wave travels is called a _____ _____
Definition
 transverse wave
Term
 Amplitude is the ____ __ ___ ____
Definition
 height of the wave
Term
 A larger amplitude means _____, smaller amplitude means ____
Definition
 more energy/ less energy
Term
 Frequency is the _______
Definition
 number of waves produced in a certain time.
Term
 How do you measure frequency?
Definition
 count the number of crests or troughs in a certain time.
Term
 Frequency is expressed in ____ and ____ equals _____
Definition
 hertz/ 1hz/ 1 wave/s
Term
 The higher the frequency, the (shorter, longer) the wavelength.
Definition
 shorter
Term
 Higher frequency means (more, less) energy
Definition
 more
Term
 What is wave speed?
Definition
 speed a wave travels
Term
 How do you find wave speed?
Definition
 measure the distance a single crest travels in a given time.
Term
 Sound travels fastest through (liquid, gas, solid). Why?
Definition
 solid/ more particles to bounce off of
Term
 Reflection
Definition
 occurs when a wave bounces back after striking a barrier ex. mirror
Term
 Refraction
Definition
 Bending of a wave as it passes at an angle from one medium to another (speed changes)
Term
 Diffraction (defense)
Definition
 the bending of a wave around a barrier or through an opening
Term
 Wave
Definition
 a disturbance that transmits energy through matter or space.
Term
 What do waves carry?
Definition
 energy
Term
 Can waves travel in a vacuum?
Definition
 yes
Term
 Medium
Definition
 the substance through which a wave can travel. Can be a solid, liquid, or gas.
Term
 Why can't you hear an alarm clock if you put it in an air tight jar?
Definition
 sound waves depend on the vibration of air molecules so they must have a medium through which to travel. In a vacuum, there are no molecules to travel through.
Term
 Mechanical Waves
Definition
 waves the require a medium. ex. sound waves, ocean waves, seismic waves, and waves on a guitar string.
Term
 If there is an explosion in space, does it make a sound? explain.
Definition
 no/ sound requires a medium to travel through and there are no molecules in space. It's a vacuum.
Term
 Are light waves mechanical? Explain
Definition
 no/ light can travel through space so it does not require a medium.
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