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Photons of energy 2.0eV fall on a metal ...

Photons of energy `2.0eV` fall on a metal plate and release photoelectrons with a maximum velocity `V`. By decreasing `lambda` and `25%` the maximum velocity of photoelectrons is doubled. The work function of the metal of the material plate in `eV` is nearly

A

2.22

B

1.985

C

2.35

D

1.8

Text Solution

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The correct Answer is:
4
`(1)/(2)mv_(max)^(2)=hv-w&hv=(hc)/(lambda)`
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NARAYNA-DUAL NATURE OF RADIATION AND MATTER-EXERCISE - 2 (H.W)
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  3. Ligth of wavelength 4000A^(@) is incident on a metal surface of work f...

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  4. A photomental is illuminated by lights of wavelenght lambda(1) and lam...

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  5. U.V. light of wavelength 800A^(@)&700A^(@) falls on hydrogen atoms in ...

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  6. In a photoelectric effect experiment, photons of energy 5eV are incide...

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  7. The number of photons emitted per second by a 62W source of monochroma...

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  8. Photons of frequencies 2.2xx10^(15) Hz and 4.6xx10^(15) Hz are inciden...

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  9. If stopping potentials corresponding to wavelengths 4000A and 4500A ar...

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  10. Photons of energy 2.0eV fall on a metal plate and release photoelectro...

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  11. A proton when accelerated through a potential difference of V volt has...

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  12. If the velocity of a particle is increased three times, then the perce...

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  13. If the momentum of electron is changed by P(m) then the de-Broglie wa...

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  14. A proton when accelerated through a p.d of V volt has wavelength lambd...

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  15. If the energy of a particle is reduced to one fourth, then the percent...

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  16. The de Broglie wavelength associated with an electron of velocity 0.3c...

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  17. The uncertainity in the position of a particle is equal to the de-Brog...

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  18. If the uncertainty in the position of proton is 6xx10^-8m, then the mi...

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  19. From Davisson-Germer experiment an alpha particle and a proton are acc...

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  20. If the uncertainity in the position of an electron is 10^(-10) m, then...

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