John is listening to a horn. He knows the frequency of the horn is 300 Hz when b

Question

John is listening to a horn. He knows the frequency of the horn is 300 Hz when both he and the horn are at rest. If he hears a pitch of 280 Hz, there are clearly several possibilities.

(True or False)

John could be moving away from the horn which is at rest.
Both could be moving and have different speeds.
Both could be moving and have the same speed.
The distance between John and the horn could be decreasing with time.
Both could be moving, in opposite directions.
Both cannot be moving in the same direction.

Explanation / Answer

Apperent frequency(280 Hz) is less than actual frequency(300 Hz)

John could be moving away from the horn which is at rest. (True).

Both could be moving and have different speeds. can not say and directions necessary(False)

Both could be moving and have the same speed. can not say and directions necessary(False)

The distance between John and the horn could be decreasing with time. (False)

Both could be moving, in opposite directions. (true)

Both cannot be moving in the same direction. if both moves peperdecular ,no shift in frequency(False)

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