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From a TV tower waves are sent normally ...

From a TV tower waves are sent normally to a plane reflector. A detector moves along this normal and covers a distance S between positions of first and nth successive maxima. Velocity of light in air is c, then probable frequency of TV waves is

A

`((n-1))/2 c/S`

B

`((n+1)/2)c/S`

C

`n c/S`

D

`((n+1))/3 c/S`

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