2. A proton is fired toward a stationary and positively charged nucleus of a He atom from a distance of 1 mm and with kinetic energy of 10' Joules. After the proton reaches the distance of the closest approach to the nucleus, its kinetic energy: (a) stays the same. (b) gets converted back into potential energy. (c) keeps increasing. (d) increases first and then remains the same. (e) keeps decreasing. (f) decreases first and then remains the same.

2. A proton is fired toward a stationary and positively charged nucleus of a He atom from a distance of 1 mm and with kinetic energy of 10' Joules. After the proton reaches the distance of the closest approach to the nucleus, its kinetic energy: (a) stays the same. (b) gets converted back into potential energy. (c) keeps increasing. (d) increases first and then remains the same. (e) keeps decreasing. (f) decreases first and then remains the same.

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter14: Nuclear Physics Applications

Section: Chapter Questions

Problem 27P

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If two nuclei are to fuse in a nuclear reaction, they must be moving fast enough so that the repulsive Coulomb force between them does not prevent them for getting within R1014mof one another. At this distance or nearer, the attractive nuclear force can overcome the Coulomb force, and the nuclei are able to fuse. (a) Find a simple formula that can be used to estimate the minimum kinetic energy the nuclei must have if they are to fuse. To keep the calculation simple, assume the two nuclei are identical and moving toward one another with the same speed v. (b) Use this minimum kinetic energy to estimate the minimum temperature a gas of the nuclei must have before a significant number of them will undergo fusion. Calculate this minimum temperature first for hydrogen and then for helium. (Hint: For fusion to occur, the minimum kinetic energy when the nuclei are far apart must be equal to the Coulomb potential energy when they are a distance R apart.)
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