University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 44 - Particle Physics and Cosmology - Problems - Exercises - Page 1519: 44.9

Answer

a). $B=1.18\,T$ b). $K=1.81\times10^{7}m/s$

Work Step by Step

$\omega=\frac{|q|B}{m}$ so, $B=\frac{\omega\,m}{|q|}$, a). $m=2.014102u-0.0005486u=2.013553u\times(1.66054\times10^{-27}Kg/u)=3.344\times10^{-27} Kg,$ $B=\frac{2\times3.14\times m\times f}{|q|}=\frac{2\times3.14\times3.344\times10^{-27}Kg \times 9.00\times10^{6} Hz}{1.602\times10^{-19}C}=1.18 \,T$ b). $k=\frac{q^{2}B^{2}R^{2}}{2m}=\frac{(1.602\times10^{-19}C)^{2}\times(1.18T)^{2}\times(0.32m)^{2}}{2\times(3.344\times10^{-27}Kg)}=3.42MeV$ Also, $k=\frac{1}{2}mv^{2}$, so, $v=\sqrt \frac{2k}{m}=1.81\times10^{7} \,m/s.$
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