Progressive wave of sound is represented by \[y=a\sin [400\pi \,t-\pi – McqOptions

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1.	Progressive wave of sound is represented by \[y=a\sin [400\pi \,t-\pi x/6.85]\] where \[x\] is in \[m\] and \[t\] is in sec. Frequency of the wave will be [RPMT 1999]
A.	200 Hz
B.	400 Hz
C.	500 Hz
D.	600 Hz
Answer» B. 400 Hz

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