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There are materials which absorb photons...

There are materials which absorb photons of shorter wavelength and emit photons of longer wavelength. Can there be stable substances which absorb photons of larger wavelength and emit light of shorter wavelength.

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MODERN PUBLICATION-UNIT TEST -07-EXERCISE
  1. There are materials which absorb photons of shorter wavelength and emi...

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  2. The photon of frequency v has a momntum associated with it .If c is th...

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  3. The time taken by a photoelectron to come out after the photon strikes...

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  4. Work function of a metl surface is 4.2 eV. The maximum wavelength whic...

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  5. Sodium and copper have work functions 2.3 eV and 4.5 eV, respectively....

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  6. A photocell is illuminated by a small bright source placed 1 m away .w...

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  7. According to Einstein's photoelectric equation, the graph between kine...

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  8. The surface of a metal is illuminted with the light of 400 nm.the kine...

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  9. The threshold freuency for a metallic surface corresponds to an energy...

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  10. This question has statement - 1 and statement - 2 of the four choice g...

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  11. Two identical photocathodes receive the light of frequencies f1 and f2...

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  12. The anode vollage of a photocell is kept fixed . The wavelength lambda...

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  13. The de-Broglie wavelength of a tennis ball of mass 60 g moving wiht a ...

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  14. If the kinetic energy of a free electron doubles,its de-Broglie wavele...

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  15. A radiation of energy E falls normally on a perfecly reflecting surfac...

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  16. Direction:Answer the MCQ no.15 to 17 on the basis of the folowing para...

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  17. Wave property of electron implies that they will show diffraction effe...

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  18. Wave property of electron implies that they will show diffraction effe...

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  19. Wavelength of the radiation of freuquency 100 Hz is :

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  20. Planck's constant has the dimetnsion of

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  21. The value of Planck's constant is

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