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Monochromatic light incident on a metal surface emits electrons with kinetic energies from zero to 2.6 eV. What is the least energy of the incident photon if the tightly bound electron needs 4.2eV to remove?

A

4.2 eV

B

1.6 eV

C

6.8 eV

D

7.0 eV

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-DUAL NATURE OF RADIATION AND MATTER-PRACTICE EXERCISEX
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  2. Light of wavelength 4000A∘ is incident on a metal surface. The maximum...

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  3. Monochromatic light incident on a metal surface emits electrons with k...

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  4. Three metals have work functions in the ratio 2 3:4. Graphs are drawn ...

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  5. Two photons of energies twice and thrice the work function of a metal ...

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  6. The work function of substance is 4.0 eV. The longest wavelength of li...

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  7. Photoelectric work function of a metal is 1eV, light of wavelength lam...

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

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  9. The work function of a substance is 12.4 eV. The longest wavelength of...

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  10. A surface irradiated with light of wavelength 480 nm gives out electro...

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  11. What P.D. must be applied to stop the fastest photo electron emitted b...

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  12. The threshold frequency for photo electric effect for a metal surface ...

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  13. The work functions of metals A and B are in the ratio 1 : 2. If light ...

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  14. When a metal surface is illuminated by light of wavelengths 400 nm and...

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  15. V(1) and V(2) are the stopping potentials for the incident radiations ...

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  16. A monochromatic source of lightis placed at a large distance d From a ...

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  17. If the work function for a certain metal is 3.2 xx 10^(-19) J and it ...

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  18. Work function of a metal is 3.0 eV. It is illuminated by a light of wa...

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  19. A metal sheet of silver is exposed to ultraviolet radiation of wavelen...

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  20. The threshold wavelength for emission of photoelectrons from a metal s...

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