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3. [Ans. : 443.52 yr] Two protons in a star are involved in a head on collision. If the kinetic energy of each of these protons is 18 keV, what would be the distance of closest approach between them ? (k = 9 X 109 Nm²C-2) [Ans. : 4 x 10-14 m) Intinnt iniected with a radioactive dose. it records

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