Which situations might cause two observers (A and B) to measure different frequencies for the same vibrating object? Select the two correct answers. (2 points)
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 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.
Observer A and Observer B are moving at different speeds relative to each other.
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 moving at different speeds relative to each other.
The two correct answers are:
1. Observer A is stationary and Observer B is moving.
2. Observer A and Observer B are stationary but at different distances from the vibrating object.
The two correct answers are:
1) Observer A is stationary and Observer B is moving.
When Observer B is moving towards or away from the vibrating object, it will lead to a change in the frequency observed by Observer B. This is due to the Doppler effect, which causes a shift in frequency based on the relative motion between the source of the sound waves and the observer.
2) Observer A and Observer B are stationary but at different distances from the vibrating object.
As sound waves travel through space, they can undergo diffraction, interference, and attenuation. These effects can cause a change in the perceived frequency when the observers are at different distances from the vibrating object. The intensity and amplitude of the sound waves can also be affected by the distance, leading to a change in frequency perception.
To determine these answers, one can consider the principles of the Doppler effect for moving observers and the effects of distance on sound wave propagation. The knowledge of these concepts can help derive the correct responses.