Threshold frequency of a certain metal for photo-electric emissi

Subject

Physics

Class

ICSE Class 12

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 Multiple Choice QuestionsShort Answer Type

11. Which electromagnetic radiation has wavelength greater than that of X rays and smaller than that of visible light?
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12. How did Fresnel construct a biprism in order to study interference of light?
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13. State Brewster’s law of polarisation of light.
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14. A thin convex lens (L1) of focal length 80 cm and a thin concave lens (L2) of focal length f are kept co-axially, 20 cm apart as shown in figure 3 below. When a narrow and parallel beam of light is incident on the convex lens, bean emerging fron the concave lens is also a parallel beam. Find f.

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15. What condition must be satisfied by two thin lenses kept in contact so that they form an achromatic doublet, i.e. a combination free from chromatic aberration ?
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16. Threshold frequency of a certain metal for photo-electric emission is 5x1014Hz. Calculate its work function.


Work function, Wo = hfo

                           = 6.62 x 10-34 x 5 x 10 14

                                    = 33.10 x 10-20

                           =3.31 x 10-19 J

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17. What conclusion was drawn by Rutherford based on Geiger-Marsden’s experiment on scattering of alpha particles?
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18. Write a balanced nuclear reaction showing emission of a β- particle by 90Th234 (Symbol of daughter nucleus formed in the process is Pa.)
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19.

What is the essential difference between the working of a nuclear reactor and that of a fission bomb?

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20. State one important use of a Zener diode.
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