# Shared Flashcard Set

waves
revision
18
Physics
9th Grade
06/03/2011

## Cards Return to Set Details

Term
 What sort of wave is a sound wave? Longitudinal wave or transverse wave?
Definition
 A sound wave is a longitudinal wave.
Term
 What sort of wave is a light wave? Longitudinal wave or transverse wave?
Definition
 A light wave is a transverse wave.
Term
 What sort of wave is a radio wave? Longitudinal wave or transverse wave?
Definition
 A radio wave is a transverse wave.
Term
 What are the movements in a longitudinal wave?
Definition
 The movements are backwards and forwards in longitudinal waves.
Term
 What are the movements in a transverse wave?
Definition
 The movements are sideways or up and down in a transverse wave.
Term
 At what speed does electromagnetic waves travel at through air?
Definition
 At a speed of 300 million m/s through air.
Term
 What is the equation for working out the wave speed?
Definition
 Wave speed    =             frequency     x    wavelength (metre / second, m/s)          (hertz, Hz)          (metre, m)
Term
 Wavelength
Definition
 The wavelength of a wave is the distance between a point on one wave and the same point on the next wave.
Term
 Amplitude
Definition
 As waves travel, they set up patterns of disturbance. The amplitude of a wave is its maximum disturbance from its undisturbed position. It is the distance between the top and the middle of a wave.
Term
 Frequency
Definition
 The frequency of a wave is the number of waves produced by a source each second. It is also the number of waves that pass a certain point each second.
Term
 What can radio waves be used for in communication?
Definition
 tv, and radio
Term
 What can microwaves be used for in communication?
Definition
 mobiles and satellite tv
Term
 What can infrared radiation be used for in communication?
Definition
 It is also used for television remote controls and in optical fibre communications.
Term
 What can microwaves be used for in communication?
Definition
Term
 What can visible light be used for in communication?
Definition
 photography
Term
 What is the equation for the speed of sound?
Definition
 speed of sound = distance travelled                          time taken
Term
 Do transverse waves need a substance to go through?
Definition
 Transverse waves do not need a substance to go through.
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