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Q.1 A parallel beam of uniform, monochromatic light of wavelength 2640 A has an intensity of 200W/m 2 . The number of photons in 1mm 3 of this radiation are

Q.1 A parallel beam of uniform, monochromatic light of wavelength 2640 A has an intensity of 200W/m2 . The number of photons in 1mm3 of this radiation are 

Question Image
Grade:10

1 Answers

Pawan Prajapati
askIITians Faculty 6228 Points
3 months ago
Answer ::

Wavelength =2640 A
Intensity = Power / Area =200
Area =1mm^2 =10^−6 m^2
Energy of 10^−6 m^2
area =200×10^−6
=2×10^−4 J/s
No. of photons =2×10^−4 /7.5×10^−19
=2.66×10^14

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