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Grade 10Modern Physics

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 for Q.1 A parallel beam of uniform, monochromatic lig

Maihar Pratap Singh

5 Years agoGrade 10

1 Answer

Pawan Prajapati

5 Years 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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