College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

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 and intensity increase. (b) The frequency decreases and the intensity increases. (c) The frequency decreases and the intensity decreases. (d) The frequency remains the same, but the intensity decreases.

To determine
The sound heard as the buzzer falls towards the ground.


Given Info: Buzzer emitting sound is falling towards the ground from the rising hot balloon.

The sound wave from the buzzer spread out spherically through all directions.

Formula to calculate Intensity of sound is,


  • I is the intensity of the sound wave.
  • P is the power of the sound source (Buzzer).
  • r is the distance from the Buzzer and the point where the sound is heard (hot balloon).

According to Doppler effect, as the relative distance between the source and the observer increase the frequency heard by the observer decreases.

The hot air balloon is raising upwards and the buzzer falling downward. Thus, the distance from the source (Buzzer) and the observer (you on the hot air balloon) decreases leading to decrease in frequency heard

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