Question

If an electron is moving with a velocity of $1.1\times {10}^{6}m{s}^{-1}$ de broglie wave length approximately is:

• A. $4.1\times {10}^{-11}m$
• B. $4.9\times {10}^{-9}m$
• C. $7\times {10}^{-10}m$
• D. $3.306\times {10}^{-8}m$

Answer 1

The correct option is C $7\times {10}^{-10}m$

$\lambda =\frac{h}{mv}$

$=\frac{6.626\times {10}^{-34}}{(9.1\times {10}^{-31}\times 1.1\times {10}^6)}$

$=6.6\times {10}^{-10}m$

$=7\times {10}^{-10}m$