21. The energy of a photon, whose momentum is 10 Me V/c, where c is the speed of light, is given by
22. The material used in the fabrication of a transistor is
23. Which one of the following element is used in solar cells?
24. If the size of the nucleus of an atom is compared with a cricket ball, then the radius of the atom is approximately equal to how many kilometres?
25. Atomic power plant works on the principle of
26. Nuclear reactors used to produce electricity are based on
27. The difference between nuclear reactor and atom bomb is that
28. Photovoltaic cell is related to
29. Who formulated India's three-stage nuclear power program?
30. Assertion (A) Photoelectric effect demonstrates the particle nature of light.
Reason (R) The number of photoelectrons is proportional to the frequency of light.
Reason (R) The number of photoelectrons is proportional to the frequency of light.
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