The wavelengths of two notes in air are 80/195 m and 80/193 m. Each note produces five beats per second with a third note of a fixed frequency. Calculate the velocity of sound in air. (answer in m/s )

Question

The wavelengths of two notes in air are 80/195 m and 80/193 m. Each note produces five beats per second with a third note of a fixed frequency. Calculate the velocity of sound in air. (answer in m/s ).

TestHub · Accepted Answer

f 1 ​ = 195 v /80 , f 2 ​ = 193 v /80 . The third note lies between them, so f 1 ​ − f 2 ​ = 10 : 80 2 v ​ = 10 , v = 400 m/s.

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