Question

Suppose you're on a hot air balloon ride, carrying a buzzer that emits a sound of frequency f. If you accidentally drop the buzzer over the side while the balloon is rising at constant speed, what can you conclude about the sound you hear as the buzzer falls toward the ground?

a. the frequency remains the same, but the intensity decreases b.the frequency decreases and the intensity increases c.the frequency and intensity increase d.the frequency decreases and the intensity decreases

Answer 1

CORRECT OPTION IS D.

the frequency decreases and the intensity decreases.

Reason: when source is moving away from observer, then frequency is given by:

f1 = f0*(V - Vo)/(V + Vs)

Vo = speed of observer

Vs = speed of source

Intensity = Power/Area

So if distance between buzzer and balloon increase, then intensity decrease.