Respuesta :
Our wavelength is getting longer because the waves are stretching out.
This make the frequency lower. The correct option is 1.
What is wavelength?
The wavelength is the distance between the adjacent trough of the sinusoidal wave.
When the wavelength is increased the waves stretch more. The wavelength is inversely proportional to the frequency
Then, increasing the wavelength will decrease the frequency. The pitch will also gets lower.
Thus the frequency gets lower we hear. The correct option is 1.
Learn more about wavelength.
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