Question

see the picture and answer
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Answer 1

Answer:

c is the correct answer of this question

Answer 2

Answer:

For a sound wave,

Speed = Wavelength x Frequency

ν = λ x f

Given that the speed of sound in air = 344 m/s

(i) For, f = 20 Hz

λ1= v/f

λ1 = 344/20

λ1 = 17.2 m

(ii) For, f= 20000 Hz

λ2= v/f

λ2= 344/20000

λ2= 0.172 m

Hence, for humans, the wavelength range for hearing is 0.0172 m to 17.2 m.

Explanation:

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