1.

The number of photons falling per second on a completely darkened plate to produce force of 6.62xx10^(-5) N is n . If the wavelength of the light falling is 5xx10^(-7) m then n = ............ xx 10^(22). ( h = 6.62 xx10^(-34)J s )

Answer»

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Solution :`P=n/t*(hc)/lamda`
`FC=n/t*(hC)/lamda`
`n/t=(Flamda)/h`
`n/t=(6.62xx10^(-5)xx5xx10^(-7))/(6.62xx10^(-34))`
= `5xx10^(22)`


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