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When a metallic surface is illuminated w...

When a metallic surface is illuminated with radiation of wavelength `lambda`, the stopping potential is `V`. If the same surface is illuminated with radiation of wavelength `2 lambda` , the stopping potential is `(V)/(4)`. The threshold wavelength surface is :

A

` 4 lamda `

B

` 5 lamda `

C

` (5 ) /(2) lamda `

D

` 3 lamda `

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The correct Answer is:
D
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MOTION-PHOTOELECTRIC EFFECT -EXERCISE - 3 SECTION -A (Previous Year Problems (NEET ))
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  2. Monochromatic light of wavelength 667 nm is produced by a helium neon ...

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  3. Light of two different frequencies whose photons have energies 1eV and...

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  4. In photoelectric emission process from a metal of work function 1.8 eV...

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  5. The threshold frequency for a photosensitive metal is 3.3 xx 10^(14) H...

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  6. An electron in the hydrogen atom jumps from excited state n to the gro...

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  7. Monochromatic radiation emitted when electron on hydrogen atom jumps f...

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  8. A modern 200 W sodium street lamp emits yellow light of wavelength 0.6...

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  9. A alpha -parhticle moves in a circular path of radius 0.83 cm in th...

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  10. An electrons of a stationary hydrogen aton passes form the fifth enegr...

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  11. Threshold frequency of a metal is 5xx10^(13)s^(-1) upon which 1xx10^(1...

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  12. The wavelength lambda(e ) of an electron and lambda(p) of a photon of...

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  13. For photoelectric emission from certain metal the cut - off frequency ...

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  14. When the energy of the incident radiation is increased by 20 % , kinet...

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  15. When a metallic surface is illuminated with radiation of wavelength la...

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  16. An electron of mass m and a photon have same energy E. The ratio of de...

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  17. Photons with energy 5 eV are incident on a cathode C in a photoelectri...

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  18. The photoelectric threshold wavelength of silver is 3250 xx 10^(-10) m...

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  19. An electron of mass m with an initial velocity vec(v) = v(0) hat(i) ...

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  20. When the light of frequency 2 v(0) (where v(0) is threshold frequency)...

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