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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 is stationary and Observer B is moving.
Observer A is stationary and Observer B is moving.

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

1 answer

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

  1. Observer A is stationary and Observer B is moving. - This situation can lead to a difference in frequency due to the Doppler effect, where the moving observer will perceive a different frequency based on their relative motion to the vibrating object.

  2. Observer A and Observer B are moving at different speeds relative to each other. - This also relates to the Doppler effect, as different speeds will result in different observed frequencies based on how their speeds impact the wavefronts of the sound or vibration from the object.

The other options do not lead to a difference in frequency. If both observers are stationary and at the same distance or at different distances from a vibrating object, they would still measure the same frequency assuming no other influences are present.