Physics SHM, waves, oscillatory motion?

Question

True or False?

the doppler effect is an observed change in frequency and amplitude of a wave produced by a moving source

True or False?

While the frequency of a wave is equal to the frequency of its source, the speed of a wave depends on the nature of the medium through which it travels.

True or False?

Simple Harmonic Motion is a case of oscillatory motion where the restoring force is proportional to the displacement of the mass relative to the equilibrium position.

Answer 1

# False (change just in frequency)

# True

# True

Answer 2

Third option is apt one.

Answer 3

just frequency, not amplitude.