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On a sunny day the speed of sound in the air is 340 m/s. 2 tuning forks A and B are sounded simultaneously. The wavelength of the sound emitted are 1.5 m and 1.68 m respectively. How many beats will produce?

Solution

Given          speed of sound = 340 m/s                                                                                                

                      Wavelength of the sound from fork B = 1.68 m

                      Wavelength of the sound from fork A = 1.5 m

Required                          No of beats produced = n =?

Formula
                           n = f1 – f2

Since the use of formula involves frequencies of the sounds, therefore, we find the frequencies first.

Therefore frequency of fork B

And frequency of fork A

Put the values in the formula, n = 226 – 202 =24 approximately (Answer)

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