A photo sensitive surface is receiving light of wavelength `5000Å` at the rate of `10^(-7)J//s`. The number of photons received per second is : (Given
A photo sensitive surface is receiving light of wavelength `5000Å` at the rate of `10^(-7)J//s`. The number of photons received per second is : (Given : h = `6.626xx10^(-34)J-s, C = 3 xx 10^(8) m//s`)
A. `3.5 xx 10^(9)`
B. `2.5 xx 10^(11)`
C. `3 xx 10^(18)`
D. ` 5 xx 10^(32)`
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Correct Answer - B
`E=n(hc)/(lambda)`
`10^(-7)= (nxx(6.626 xx 10^(-34)Js)(3xx 10^(8) m//s))/(5000xx10^(-10)m)`
` n = 2.5 xx 10^(11)` photons per second
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