A) \[{{90}^{o}}\]
B) \[{{270}^{o}}\]
C) \[{{0}^{0}}\]
D) \[{{180}^{0}}.\]
Correct Answer: D
Solution :
Impact parameter \[b\propto \cot \frac{\theta }{2}\] Here \[b=0,\,\]hence, \[\theta ={{180}^{o}}\]
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