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 320 Hz, there are clearly several possibilities.

True False  Both could be moving and have different speeds.
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 and have the same speed.
True False  The distance between John and the horn could be increasing with time.
True False  Both could be moving, in opposite directions.

Explanation / Answer

since the apparent frequency heard by the observer increases,then

there must be a relative motion between John and horn

Both could ne moving and have different speeds---True

Both cannot be moving in the same direction ---True

John could be moving towards the horn which is at rest ----True

Both could be moving and have the same speed ---Flase

The distance between John and the horn could be increasing with time ---- False

Both could be moving in opposite directions---------True

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