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The work function for sodium surface is ...

The work function for sodium surface is 2.0eV and that for aluminium surface is 4.2eV. The two metals are illuminated with appropriate radiations so as to cause protoemission. Then

A

Both aluminium and sodium will have the same threshold frequency

B

The threshold frequency of aluminium will be more than that of sodium

C

The threshold frequency of aluminium will be less than that of sodium

D

The threshold wavelength of aluminium will be more than that of sodium

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The correct Answer is:
B
The threshold frequency for `Al` must be greater it has higher work function.
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RESONANCE ENGLISH-ATOMIC PHYSICS-Exercise (2) Only one option correct type
  1. The photoelectrons emitted from a metal surface:

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  2. A point source of light is used in a photoelectric effect. If the sour...

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  3. The work function for sodium surface is 2.0eV and that for aluminium s...

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  4. A point source causes photoelectric effect from a small metal plate. W...

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  5. In a photoemissive cell, with exiciting wavelength is changed to (33la...

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  6. A light source is at a distance d from a photoelectric cell, then the ...

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  7. The frequency and intensity of a light source are both doubled. Consid...

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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. An image of the sun is formed by a lens, of the focal length of 30 cm,...

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  10. The work function of a certain metal is (hC)/lambda(0). When a monochr...

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  11. Radiation pressure on any surface (for given intensity):

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  12. The radiation force experienced by body exposed to radiation of intens...

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  13. Which one of the following statements is NOT true for de Broglie waves...

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  14. An alpha particle of energy 5 MeV is scattered through 180^(@) by a fi...

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  15. The Wavelengths of K(alpha) X - rays of two metals A and B are 4/(1875...

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  16. An atom consists of three energy levels given by a ground state with e...

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  17. Let v(1) be the frequency of the series limit of the Lyman series, v(2...

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  18. The energy different between the first two levels of hydrogen atom is ...

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  19. The relation between lambda(1)= wavelength of series limit of Lyman se...

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  20. Ultraviolet light of wavelengths lambda(1) and lambda(2) when allowed ...

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