Question

What occurs with the doppler effect are changes in _____. view available hint(s) what occurs with the doppler effect are changes in _______. frequency due to motion the speed of sound due to motion both of these answers are correct. neither of these answers is correct?

Answer 1

Answer: The correct answers are "frequency" and "due to motion".

Explanation:

Doppler effect: It is the phenomenon in which there is an apparent change in the frequency of the wave. There is an increase or decrease in the frequency of the wave. This phenomenon occurs when there is relative motion between the source and observer or between the listener or source.

If the source and listener are moving towards each other then there will an increase in the frequency.

Doppler effect is not only applicable for sound but also for light.

Therefore, the Doppler effect occurs with changes in frequency. Doppler effect occurs with change in the frequency due to the motion.

Answer 2

The answer is the following:
"what occurs with Doppler effect are changes in frequency due to motion"
The Doppler effect occurs when the source of a wave and the observer are moving relative to each other. Due to this fact, the observer will see the wave moving at a different velocity v' with respect to the real velocity of the wave as emited by the source. As a consequence, the frequency of the wave as seen by the observer is shifted, according to the following relationship:
$f'= \frac{v \pm v_r}{v \pm v_s} f$
where:
f' is the apparent frequency, as seen by the observer
f is the real frequency
v is the velocity of the wave
vr is the velocity of the observer relative to the source of the wave (it is positive if the observer is moving towards the source, negative if he is moving away)
vs is the velocity of the source relative to the observer (it is positive if the source is moving away from the observer, negative if it is moving towards him)