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Sodium and copper have work functions 2....

Sodium and copper have work functions `2.3 eV` and `4.5 eV`, respectively. Then, the ratio of the wavelengths is nearest to

A

`1:2`

B

`4:1`

C

`2:1`

D

`1:4`

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MODERN PUBLICATION-UNIT TEST -07-EXERCISE
  1. The time taken by a photoelectron to come out after the photon strikes...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  18. Planck's constant has the dimetnsion of

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  19. The value of Planck's constant is

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  20. The energy of a photon of wavelelngth lambda is

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