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Scientist ……..invented electron....

Scientist ……..invented electron.

A

Roentgen

B

J.J Thomson

C

Max-Planck

D

William crookes

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The correct Answer is:
B
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KUMAR PRAKASHAN-DUAL NATURE OF RADIATION AND MATTER-Section-D (multiple choice questions (MCQs)
  1. Scientist ……..invented electron.

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  2. Which scientist invented cathode rays?

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  3. Scientist……proved that electric charge is quantized.

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  4. When a clean metal surface incident with radiation of sufficiently hig...

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  5. SI unit of work function is……

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  6. Value of work function depend on……

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  7. Which of the following is best metal for photoelectric emission?

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  8. Frequency of radiation incident on metal surface is called threshold f...

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  9. For most of metals threshold frequency lies in which region of electro...

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  10. For alkali metals threshold frequencies lie in which region?

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  11. For photosensitive surface threshold wavelength is 5200Å .When monochr...

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  12. Electrons are emitted from photo-cell with maximum speed of 4xx10^(8) ...

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  13. Radiation of 4f(0) frequency is incident on metal surface with f(0) th...

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  14. Work function of metal is phi wavelength of incident light is lambda.W...

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  15. Four photon of lambda gt lambda(0) are incident on metal surface ……..p...

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  16. If ratio of threshold frequencies of two metals is 1:3 ,ratio of their...

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  17. When a piece of sodium or potassium are exposed to sunlight ……..

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  18. If photo-electric effect is not seen with the ultraviolet radiation in...

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  19. Threshold wavelength of metal is 30 Å If radiation of 2000Å Is inciden...

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  20. Work function of metal A,B and C are 4.5 eV 4.3 eV and 3.8eV respectiv...

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