Please solve 21

Please solve 21 Ans. n = FJh'V. We have, E = nh•v, 6624 x 10-3 = 1022 approx. or n = 6-62 x 10-34 X 1012 20. Calculate the frequency of a photon whose energy is 75 eV. Ans. 18-2 x Hz. 21. Find out the energy of a photon whose (a) wavelength is 9-6A; (b) wavelength is 6000A; and (c) frequency is 2000 kilocycles. Ans. (a) 3-3 x 10-15 joule, (b) 3-3 x 10-19 joule, (c) 13•24 x 10-3

The answers for bit a and c are wrong.

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