Waves

Question	Answer
when a longitudinal wave passes through air, what happens to the air particles at a compression ?	They are pushed closer together.
What type of wave can be produced on a stretched string ?	Transverse, Mechanical waves
What is the speed of waves with a frequency of 5 Hz and a wavelength of 2 m ?	10 m/s
What is the unit of frequency ?	Hertz, hz
What is the normal ?	A kine drawn perpendicular to a reflecting surface
What size is the image in a plane mirror ?	The same size as the object
Why does refraction takes place ?	Because waves change speed when they cross a boundry
Why does light split up into different colours when it passes through a triangular prism ?	Because different wavelengths of light are refracted by different amounts
Why don't we often observe the diffraction of light during everyday life ?	Because the wavelength of light is very short
What sort of waves are diffracted ?	All waves are diffracted
What is the range of frequencies that can be heard by the human ear ?	20 Hz to 20000 Hz (20 kHz)
What is the reflection of a sound called ?	An echo
what happens to the pitch of a note as the frequency decreases ?	A pitch decreases
Why do different instruments sound different when they play the same note ?	The waveforms are different

Resource summary

	Created by nadine pownall over 9 years ago