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# If uncertainty in position and momentum are equal, then uncertainity in velocity is

$\begin{array}{1 1} (a)\;\large\frac{1}{2m} \sqrt {\large\frac{h}{\pi}} \\(b)\;\sqrt {\large\frac{h}{2 \pi}} \\ (c)\;\large\frac{1}{m} \sqrt {\large\frac{h}{\pi}} \\ (d)\; \sqrt{\large\frac{h}{\pi}} \end{array}$

$\large\frac{1}{2m} \sqrt {\large\frac{h}{\pi}}$
$(\Delta x) \times (\Delta p) \geq \large\frac{h}{4 \pi}$
$\Delta v^2= \large\frac{h}{m^2 4 \pi}$
$\Delta v= \large\frac{1}{2m} \sqrt {\large\frac{h}{\pi}}$
$\Delta E. \Delta t \geq \large\frac{h}{4 \pi}$