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Sodium and copper have work functions 2....

Sodium and copper have work functions 2.3eV and 4.5eV respectively, then the ratio of the threshold wavelengths is nearest to

A

`1:2`

B

`4:1`

C

`2:1`

D

`1:4`

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-DUAL NATURE OF RADIATION AND MATTER-EXERCISE=II
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  2. Radiations of two different frequencies whose photon energies are 3.4 ...

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  3. Sodium and copper have work functions 2.3eV and 4.5eV respectively, th...

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  4. A graph is drawn between stopping potential (y-axis) and incident freq...

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  5. A photo cell is illuminated by a small bright source placed (1)/(2) m ...

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  6. A photon incident on a metal of photo electric work function 2 ev prod...

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  7. For a certain metal the threshold frequency is v(0). If light of frequ...

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  8. In a photoelectric cell, current stops when a negative potential of 0....

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  9. The K.E. of photo electron ejected from a metal surface by light of wa...

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  10. The work function of potassium is 2.0 eV. When it is illuminated by li...

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  11. Photo electric emission is observed from a metallic surface for freque...

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  12. When radiation of the wavelength lamdais incident on a metallic surfac...

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  13. K(1) and K(2) are the maximum kinetic energies of the photo electrons ...

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  14. Light of frequency 1.5 times the threshold frequency is incident on a ...

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  15. The maximum wavelength of a beam of light can be used to produce photo...

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  16. The work function of a material is 5.3 eV and the stopping potential f...

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  17. The energy flux of sunlight reaching the surface of the earth is 1.388...

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  18. The threshold frequency for a certain metal is v(0). When a certain ra...

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  19. The work function of a certain metal is 3.31xx10^-(-19) jthen, the max...

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  20. A photon of energy .E. ejects a photoelectron from a metal surface who...

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