Waves Unit Test

Question

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Question
A stationary source produces a sound wave at a frequency of 100 Hz. The wave travels at 1125 feet per second. A car is moving toward the sound source at a speed of 200 feet per second.

What is the wavelength of the stationary sound source and the wavelength that a person in the car perceives?

(1 point)
Responses

wavelength of the stationary source: 11.25 ft; perceived wavelength: 9.25 ft
wavelength of the stationary source: 11.25 ft; perceived wavelength: 9.25 ft

wavelength of the stationary source: 9.25 ft; perceived wavelength: 11.25 ft
wavelength of the stationary source: 9.25 ft; perceived wavelength: 11.25 ft

wavelength of the stationary source: 11.25 ft; perceived wavelength: 13.25 ft
wavelength of the stationary source: 11.25 ft; perceived wavelength: 13.25 ft

wavelength of the stationary source: 13.25 ft; perceived wavelength: 11.25 ft
wavelength of the stationary source: 13.25 ft; perceived wavelength: 11.25 ft

Answer 1

Correct response: wavelength of the stationary source: 11.25 ft; perceived wavelength: 9.25 ft