Question

Which situations might cause two observers (A and B) to measure different frequencies for the same vibrating object? Select the two correct answers. (1 point)
Responses

Observer A and Observer B are both stationary and at the same distance from the object.
Observer A and Observer B are both stationary and at the same distance from the object.

Observer A and Observer B are moving at different speeds relative to each other.
Observer A and Observer B are moving at different speeds relative to each other.

Observer A and Observer B are stationary but at different distances from the vibrating object.
Observer A and Observer B are stationary but at different distances from the vibrating object.

Observer A is stationary and Observer B is moving.

Answer 1

The two correct answers that might cause observers A and B to measure different frequencies for the same vibrating object are:

1. **Observer A and Observer B are moving at different speeds relative to each other.**
2. **Observer A is stationary and Observer B is moving.**

These situations involve the Doppler effect, where the frequency of a wave changes due to the relative motion between the observer and the source of the wave.