x(1)=12sin(484pit-7pix) and x(2)=12sin(4...

`x_(1)=12sin(484pit-7pix) and x_(2)=12sin(480pit-7pix)` represent the equation of two sound waves and x and t are in metre and second. Beat frequency (in Hz) produced by these two waves is

A

4

B

3

C

2

D

1

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