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The energy flux of sunlight reaching the...

The energy flux of sunlight reaching the surface of the earth is `1.388 xx 10^(3) W//m^(2)` . How many photons (nearly) per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of 550 nm.

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`4xx10^(21)" photons/m"^(2)s`
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NCERT GUJARATI-DUAL NATURE OF RADIATION AND MATTER-EXERCISES
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  2. Monochromatic light of wavelength 632.8 nm is produced by a helium-neo...

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  8. Light of frequency 7.21 xx 10^(14) Hz is incident on a metal surface. ...

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  13. What is the de Broglie wavelength of (a) a bullet of mass 0.040 kg t...

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  14. An electron and a photon each have a wavelength of 1.00 nm. Find (a)...

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  15. (a) For what kinetic energy of a neutron will the associated de Brogli...

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  16. Show that the wavelength of electromagnetic radiation is equal to the ...

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  17. What is the de Broglie wavelength of a nitrogen molecule in air at 300...

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  18. (a) Estimate the speed with which electrons emitted from a heated emit...

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  19. (a) A monoenergetic electron beam with electron speed of 5.20 xx 10^(6...

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