1.

The mean wavelength of light from sun is taken to be 550 nm and its mean power is 3.8 xx 10^(26) W. The number of photons received by the human eye per second on the average from sunlight is of the order of………………

Answer»

`10^(45)`
`10^(42)`
`10^(54)`
`10^(51)`

SOLUTION :`P = (n)/(t) (HC)/(lambda)`
`therefore""(n)/(t) = (P lambda)/(hc) = (3.8 XX 10^(26) xx 550 xx 10^(-9))/(6.6 xx 10^(-34) xx 3 xx 10^(8)) = 1 xx 10^(45)`


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