John is listening to a horn. He knows the frequency of the horn is 300 Hz when b
ID: 1261325 • 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 330 Hz, there are clearly several possibilities.
True False The distance between John and the horn could be increasing with time.
True False Both could be moving and have the same speed.
True False Both cannot be moving in the same direction.
True False John could be moving towards the horn which is at rest.
True False Both could be moving, in opposite directions.
True False Both could be moving and have different speeds.
Explanation / Answer
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 330 Hz, there are clearly several
possibilities. (Give ALL correct answers, i.e., B, AC, BCD...)
QUESTION:
A) John is moving towards the horn at rest.
B) Both can be moving and have the same speed.
C) Both can be moving and have different speeds.
D) Both can be moving, in opposite directions.
E) The distance between John and the horn is increasing with time.
F) Both cannot be moving in the same direction.
ANSWER:
A) True, when John moves towards the horn, it is the same as if he stood still
and the horn moved towards him.
B) True, if they are moving toward each other at the right speed, John would
hear more waves per unit time, thus a higher frequency.
C) True, the horn could be getting closer to John.
D) True, same as B, they can approach each other to achieve this effect.
E) False, it must be decreasing to hear a higher frequency.
F) False, they could be. If both are moving and the horn is catching up to John,
this effect could be achieved.
Be careful, this problem is looking for the TRUE answers... so answer ABCD (or
whatever answers are true).
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