A source emits sound with a frequency of 1000 Hz. It and an observer are moving toward each other, each with a speed of 100 m/s. If the speed of sound is 340 m/s, the observer hears sound with a frequency of:
A) 294 Hz
B) 545 Hz
C) 1000 Hz
D) 1830 Hz
E) 3400 Hz

Question

Quizplus · Accepted Answer

The Doppler effect formula for sound when both source and observer are moving towards each other is: f' = f * (v + vo) / (v - vs), where f' is the observed frequency, f is the source frequency, v is the speed of sound, vo is the observer's speed, and vs is the source's speed. Substituting the given values: f' = 1000 * (340 + 100) / (340 - 100) = 1830 Hz.

A Source Emits Sound with a Frequency of 1000 Hz