If uncertainty in position and momentum are equal, then the uncertainty in velocity is:

1. $\frac{1}{2\mathrm{m}}\sqrt{\frac{\mathrm{h}}{\mathrm{\pi }}}$

2. $\sqrt{\frac{\mathrm{h}}{2\mathrm{\pi }}}$

3. $\frac{1}{\mathrm{m}}\sqrt{\frac{\mathrm{h}}{\mathrm{\pi }}}$

4. $\sqrt{\frac{\mathrm{h}}{\mathrm{\pi }}}$

If the mass of electron is 9.11×10^-31 kg  and the planck's constant is 6.626 ×10^-34 Js, then the uncertainty involved in the measurement of velocity within a distance of 0.1 Å is:

1. $5.79\times {10}^6$ $m{s}^{-1}$

2. $5.79\times {10}^7$ $m{s}^{-1}$

3. $5.79\times {10}^8$ $m{s}^{-1}$

4. $5.79\times {10}^5$ $m{s}^{-1}$