The correct figure that shows , schemati...

The correct figure that shows , schematically , the wave pattern produced by superposition of two waves of frequencies 9 Hz and 11 Hz, is :

A

B

C

D

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The correct Answer is:

D

`f_b = (11 – 9) = 2 Hz`
`T_(b) =1/2 sec. = 0.5 sec `

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