question_answer

The speed of an electron having a wavelenth of the order of \[1\overset{o}{\mathop{A}}\,\] will be:

A)  \[7.25\times {{10}^{6}}m/s\]            

B) \[6.26\times {{10}^{6}}m/s\]

C) \[5.25\times {{10}^{6}}m/s\]

D) \[4.25\times {{10}^{6}}\]

Correct Answer: A

Solution :

As,       \[V=\frac{p}{m}=\frac{h}{mh}\] or