If a sound source is moving away from the observer, then the observer will notic

Question

If a sound source is moving away from the observer, then the observer will notice that the frequency increases and the wavelength decreases both the frequency and wavelength decrease the frequency decreases and the wavelength remains unchanged the frequency decreases and the wavelength increases both the frequency and the wavelength are unchanged A trumpet player hears 5 beats per second when she plays a note and simultaneously sounds a 440 Hz tuning fork. After pulling her tuning valve out to slightly increase the length of her trumpet, she hears 3 beats per second against the tuning fork. Was her initial frequency 435 Hz or 445 Hz? Explain

Explanation / Answer

from Doppler effect,

the relative motion of sourec and sound increases the frequency

so here

if when Source is moving away from the observer, frequency decreases and wavelength increases

Option D it is

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beat frequency f = fa - fb = 440

fa = 440 + fb

fa = 440 + 5

fa = 445 Hz

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