Monochromatic light of wavelength `3000 Å` is incident on a surface area `4 cm^(2)`. If intensity of light is `150 m W//m^(2)` , then rate at which photons strike the target isA. `3 xx 10^(10) //sec`B. `9 xx 10^(13)//sec`C. `7 xx 10^(15)//sec`D. `6 xx 10^(19)//sec`

Monochromatic light of wavelength `3000 Å` is incident on a surface a

1.	Monochromatic light of wavelength `3000 Å` is incident on a surface area `4 cm^(2)`. If intensity of light is `150 m W//m^(2)` , then rate at which photons strike the target isA. `3 xx 10^(10) //sec`B. `9 xx 10^(13)//sec`C. `7 xx 10^(15)//sec`D. `6 xx 10^(19)//sec`
Answer» Correct Answer - B `(n)/(t) = (I A lambda)/(hc) = (150 xx 10^(-3) xx 4 xx 10^(-4) xx 3 xx 10^(-7))/( 6.6 xx 10^(-34) xx 3 xx 10^(8))` `= 9 xx 10^(13) (1)/( sec)`

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Monochromatic light of wavelength `3000 Å` is incident on a surface area `4 cm^(2)`. If intensity of light is `150 m W//m^(2)` , then rate at which photons strike the target isA. `3 xx 10^(10) //sec`B. `9 xx 10^(13)//sec`C. `7 xx 10^(15)//sec`D. `6 xx 10^(19)//sec`

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