Question

The de-Broglie wavelength associated with a ball of mass 1kg having kinetic energy 0.5 J is

• A. $6.626\times {10}^{-34}m$
• B. $13.20\times {10}^{-34}m$
• C. $10.38\times {10}^{-21}m$
• D. $6.626\times {10}^{-34}\stackrel{\circ }{A}$

Answer 1

The correct option is A $6.626\times {10}^{-34}m$

$\lambda =\frac{h}{\sqrt{2m\times KE}}=\frac{6.626\times {10}^{-34}}{\sqrt{2\times 1\times 0.5}}=6.626\times {10}^{-34}m$