A) \[2.58\times {{10}^{-4}}m\]
B) \[3.58\times {{10}^{-4}}m\]
C) \[2.58\times {{10}^{-3}}m\]
D) \[3.58\times {{10}^{-3}}m\]
Correct Answer: B
Solution :
(b) \[3.58\times {{10}^{-4}}m\] \[E=\frac{1}{2}m{{v}^{2}}\Rightarrow v=\sqrt{\frac{2E}{m}}(\because {{m}_{e}}=m)\] \[r=\frac{mv}{Be}=\frac{m}{Be}\sqrt{\frac{2E}{m}}=\frac{\sqrt{2mE}}{Be}\] \[r=\frac{\sqrt{2\times 1800\times 1.6\times {{10}^{-19}}\times 9.1\times {{10}^{-31}}}}{1.6\times {{10}^{-19}}\times 0.4}\] \[=3.58\times {{10}^{-4}}m\]You need to login to perform this action.
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