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 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 both stationary and at the same distance from the object. 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.
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 and Observer B are moving at different speeds relative to each other.
Explanation: When two observers are moving at different speeds relative to each other, they will measure different frequencies for the same vibrating object. This effect is known as the Doppler shift, where the motion of the observer affects the perceived frequency of the waves.
2. Observer A and Observer B are stationary but at different distances from the vibrating object.
Explanation: When two observers are stationary but at different distances from the vibrating object, they will measure different frequencies. This is due to the phenomenon of the inverse square law, which states that the intensity of a wave decreases with the square of the distance from the source. As the observers are at different distances, they will experience different intensities of the wave, leading to different measured frequencies.
The other options provided (Observer A and Observer B both stationary and at the same distance from the object, or Observer A is stationary and Observer B is moving) would not cause the observers to measure different frequencies for the same vibrating object.
The two correct answers are:
1. Observer A and Observer B are moving at different speeds relative to each other.
2. Observer A and Observer B are stationary but at different distances from the vibrating object.