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Question
Q172) If kinetic energy of a proton is increased nine times, the wavelength of the de-Broglie wave associated with it would become



SOLUTION

de-Brogli wavelength interms of kinetic energ E is given by

From equation when Kinetic energy E. of the electron increased 9 times. The de-Broglie wavelength decreased by 1/3 times.
Answer:(c)