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When a certain metallic surface is illum...

When a certain metallic surface is illuminated with mono chromatic light of wavelength `lambda`, the stopping potential for photoelectric current is `3V_(0)`. When the same surface is illuminated with light of wavelength `2lambda` the stopping potential is `V_(0)`. The threshold wavelength for this surface for photoelectric effect is.

A

`6lambda`

B

`4 lambda`

C

`lambda//4`

D

`8lambda`

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PHYSICS GALAXY - ASHISH ARORA-PHOTOELECTRIC EFFECT AND MATTER WAVES-Numerical MCQs
  1. Radiation of frequency 1.5 times the threshold frequency is incident o...

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  2. The maximum kinetic energy of photoelectrons emitted from a surface wh...

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  3. When a certain metallic surface is illuminated with mono chromatic lig...

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  4. In the photoelectric experiment, if we use a monochromatic light, the ...

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  5. The eye can detect 5xx10^(4) photons (m^2s)^(-1) of green light (lamda...

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  6. A metal whose work function is 3.3eV is illuminated by light of wavele...

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  7. In Q 28, the maximum energy of photoelectrons is:

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  8. In Q.28, what is the stopping potential?

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  9. A point source of radiation power P is placed on the x-axis of an idea...

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  10. A sensor is exposed for time t to a lamp of power P placed at a distan...

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  11. The de-Broglie wavelength of an electron moving with a velocity 1.5 xx...

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  12. Monochromatic light of frequency v(1) irradiates a photocell and the s...

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  13. An electromagnetic radiation of frequency 3 xx 10^(15) cycles per seco...

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  14. Two identical photocathode receive light of frequencies f(1) and f(2)....

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  15. A metal plate is exposed to light with wavelength lambda. It is observ...

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  16. The energy of an alpha-particle, whose de-Broglie wavelength is 0.004Å...

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  17. A small potassium foil is placed (perpendicular to the direction of in...

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  18. A photon and an electron posses same de-Broglie wavelength. Given that...

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  19. The maximum velocity of photoelectronos emitted hy a photoemitter is 1...

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  20. A proton with KE equal to that a photono (E = 100 keV). lambda(1) is t...

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