Wave properties I Flashcards
1
Q
What are wavefronts?
A
lines of constant phase, e.g. crests
the direction in whick a wave travels is at right angles to the wave fronts
2
Q
What is refraction?
A
when waves pass across a boundary at which the wave speed changes the wavelenght also changes
if the wavefronts approach at an angle to the boundary they change direction as well as speed
3
Q
How does diffraction occur?
A
waves spread out after passing through a gap or around an obstacle
the narrower the gap, the more the waves spread out
longer the wavelength the more the waves spread out
4
Q
Why is the bigger the dish the stronger the signal is?
A
more radio waves are reflected
