A sound wave travels at a speed of 339 m s –1 . If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?

Answer 

Speed of sound = v = 339 m/s

Wavelength = λ = 1.5cm

                          = 1.5/100 m

                          = 0.015m

 

Now,

Speed of sound = Wavelength × Frequency

Frequency = Speed of sound/ Wavelength

                  = v/ λ

                  = 339/0.015

                  = 339 × 1000 /15

                  = 22600 Hz

 

Frequency of sound is 22,600 Hz.

 

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The audible range of human ear is 20 Hz to 20,000 Hz.

Since the frequency of sound is greater than 20,000 Hz, it won’t be audible .

  1. Class 9
  2. Chapter 12 Class 9 - Sound (Deleted)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo