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 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 and Observer B are stationary but at different distances from the vibrating object.
Observer A is stationary and Observer B is moving.
Observer A and Observer B are moving at different speeds relative to each other.
When will a scientist observe redshift in the spectrum of a distant space object?(1 point)
Responses
when the object is stationary
when the object is stationary
when the object is moving toward the scientist
when the object is moving toward the scientist
when the object is moving away from the scientist
when the object is moving away from the scientist
when the object is in the same frame of reference as the scientist
when the object is moving away from the scientist
Why do scientists observe blueshift in certain stars?(1 point)
Responses
Light wave frequencies decrease as an object moves toward the observer.
Light wave frequencies decrease as an object moves toward the observer.
Light wave frequencies increase as an object moves toward the observer.
Light wave frequencies increase as an object moves toward the observer.
Stars with lower temperatures emit more light waves at the blue end of the spectrum.
Stars with lower temperatures emit more light waves at the blue end of the spectrum.
Stars with higher temperatures emit more light waves at the blue end of the spectrum.
Light wave frequencies increase as an object moves toward the observer.
The two correct answers are:
1. Observer A is stationary and Observer B is moving.
When Observer A is stationary and Observer B is moving, the motion of Observer B can cause a change in the relative velocity between the vibrating object and Observer B. This change in velocity can lead to a phenomenon called the Doppler effect, where the frequency of the waves emitted by the vibrating object appears different to Observer B compared to Observer A.
3. Observer A and Observer B are moving at different speeds relative to each other.
When Observer A and Observer B are moving at different speeds relative to each other, the relative motion between the two observers can again result in the Doppler effect. The difference in their velocities leads to a change in the observed frequency of the vibrating object between the two observers.
To summarize, both the relative motion between the observers and the vibrating object, as well as the relative motion between the two observers themselves, can cause the measurement of different frequencies for the same vibrating object.