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An F.M radio is broadcasting at 100mHz .How many photons ...

Sent to General Experts April 7 2006 at 6:59 PM
   

An F.M radio is broadcasting at 100mHz .How many photons per sec must receive by radio in order to detect a signal of 1* 10^ -2 w.

 

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April 7 2006 at 8:06 PM (1 hour and 7 minutes and 1 second later)
         
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Each photon has energy

E = h f = 6.624*10^-34 J sec*10^8 s^-1 = 6.624*10^-26 J per photon (h is Planck's constant)

(photons/s) * (J/photon) = 10^-2 J/s

10^-2/6.624*10^-26 = 1.51*10^23 photons/s

must be received



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