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chegg A device that both emits and receives sound waves is traveling at 80 km/h. The emitted waves have a frequency of 700 Hz. If the waves are reflected off a stationary flat surface in front of the device, what frequency is detected by the device

Respuesta :

Frequency detected by the device 752.4 Hz

Given:

speed of sound waves = 80 km/h

frequency = 700 Hz.

The general formula for apparent frequency is

f′ = v∓u/v±u*f

As observer is at rest so u = 0

Since the source moves towards cliff, i.e., effectively the source moves towards the observer (the sound being heard through echo),

so u taken as −u = 23m/s

f′ = v*f/v - u = 330*700/330-23 = 752.4 Hz

The frequency detected by the device 752.4 Hz

Learn more about Frequency here:

https://brainly.com/question/254161

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