Question

Sound waves of wavelength 4 cm have a velocity of 340 m/s in air. What is their frequency? *



A)85 Hz

B)8.5 Hz

C)8500 Hz

D)850 Hz

 


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Answer 1

Answer:

Hello friend

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Thanks for your question.

=) Given:

Wavelength = 1cm

= 1 x 10^-2m.

Velocity Of sound = 340m/s.

frequency =?

We know that,

Velocity = frequency x Wavelength

frequency = Velocity/wavelength

frequency = 340/1 x 10^-2

frequency = 340 x 10^2

frequency = 340 x 100

frequency = 34000Hz.

This frequency is more than 20,000Hz and thus this sound can not be heard by human ear.

I hope this will helps you.

Thanks.

Answer 2

Answer:

a is the best answer

Explanation:

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