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A 25 watt bulb emits monochromatic y...

A 25 watt bulb emits monochromatic yellow light of wavelength of 0.57 `mu m ` .Calculate the rate of emission of quanta per second .

Text Solution

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Energy of bulb =25 watt =25 `js^(-1) ` energy (E )
E = hv = `(hc )/( lambda)`
`=(6.626 xx 3.0)/( 0.57) xx 10^(20) J` per photon
Quantum velocity `=("Emit energy bulb")/( "Emit energy of photon ")`
`=(25 js^(-1) xx 0.57)/(6.626 xx 3.0 xx 10^(20)J)`
`7.169 xx 10^(19) s^(-1)`
`=7.17 xx 10^(19) s^(-1)`
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