John is listening to a horn. He knows the frequency of the horn is 300 Hz when b
ID: 1434715 • Letter: J
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 260 Hz, there are clearly several possibilities.
True False Both could be moving and have different speeds.
True False Both could be moving and have the same speed.
True False The distance between John and the horn could be decreasing with time.
True False Both could be moving, in opposite directions.
True False John could be moving away from the horn which is at rest.
True False Both cannot be moving in the same direction.
Explanation / Answer
As the observed frequency is 260 Hz which is less than the emitted frequency 300 Hz,
there are several possibilities.
True - Both could be moving and have different speeds.
True - Both could be moving and have the same speed.
False - The distance between John and the horn could be decreasing with time.
True - Both could be moving, in opposite directions.
True - John could be moving away from the horn which is at rest.
True - Both cannot be moving in the same direction.
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