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The power of a bulb is 60 milliwatt a...

The power of a bulb is 60 milliwatt and the wavelength of light is 6000 Å. Calculate the number of photons/sec. emitted by the bulb ?

Text Solution

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nhv = Power
or ` (nhc)/(lamda) = P `
or ` n = ( P lamda ) / (hc) = (60 xx 10 ^(-3) xx 6000 xx 10 ^( -10))/( 6.62 xx 10^( -34) xx 3 xx 10 ^(8)) ` photon/sec.
` =1.8 xx 10^(17) ` Photon/sec.
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