T9.5 Doppler effect

Question 1

Doppler effect

Answer 1

The change in the frequency of a wave received (perceived) by an observer, compared to the actual frequency with which it was emitted.

Question 2

Moving source, a stationary observer

Answer 2

Source moving towards the observer (frequency is higher)

Source moving away the observer (frequency is lower)

Question 3

Moving observer, stationary source

Answer 3

Observer moving toward the source (frequency is higher)

Observer moving away from the observer (frequency is lower)