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The work function of a substance is 4.0 ...

The work function of a substance is 4.0 eV.The longest wavelength of ight that can cause phtotelctron emission from this substance is approximately

A

540 nm

B

400 nm

C

310 nm

D

220 nm\]

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MODERN PUBLICATION-UNIT TEST -07-EXERCISE
  1. Photoelecttric effect supports the qunatum nature of light,becuse

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  2. the strength of photoelectric curent depends upon

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  3. The work function of a substance is 4.0 eV.The longest wavelength of i...

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  4. The maximum kinetic energy of phtoelectrons emitted from a surface,whe...

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  5. The threshold wavelength for photoelectric effect for a material is 52...

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  6. A photo-sensitive material would emit elecrons.if excited by photons b...

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  7. Photoelectrons are being obtained by irradiating zinc by a radiation o...

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  8. Ultraviolet radiaiton of 6.2 eV falls on an aluminium surface(work fun...

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  9. When a monochromatic point source of light is at a distance of 0.2 m f...

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  10. The figrue shows the variation of photocurrent with anode potential fo...

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  11. The graph between 1 //lambda and stopping potential (V) of three metal...

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  12. The energy of a photon is equal to the kinetic energy of a proton.The...

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  13. A particle of mass M at rest decays into two particles of masses m1 an...

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  14. A beam of electrons is used in an Young's double slit experiment.The s...

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  15. Electrons with de-Broglie waveelngth lambda fall on the target in an X...

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  16. Electron volt is a unit of

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  17. When a proton is accelerated with IV potential difference, then its ki...

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  18. Unit of Planck constant is :

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  19. Which one of the following statements about photon is incorrect?

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  20. A photon behaves as if it had a mass equal to

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