Waves

when a longitudinal wave passes through air, what happens to the air particles at a compression ?

What type of wave can be produced on a stretched string ?

What is the speed of waves with a frequency of 5 Hz and a wavelength of 2 m ?

What is the unit of frequency ?

What is the normal ?

What size is the image in a plane mirror ?

Why does refraction takes place ?

Why does light split up into different colours when it passes through a triangular prism ?

Why don't we often observe the diffraction of light during everyday life ?

What sort of waves are diffracted ?

What is the range of frequencies that can be heard by the human ear ?

What is the reflection of a sound called ?

what happens to the pitch of a note as the frequency decreases ?

Why do different instruments sound different when they play the same note ?