Question

What will be de Broglie wavelength of an electron moving with a velocity of $1.2\times {10}^{5}m{s}^{-1}$?

• A. $6.068\times {10}^{-9}m$
• B. $3.133\times {10}^{-37}m$
• C. $6.626\times {10}^{-9}m$
• D. $6.018\times {10}^{-7}m$

Answer 1

Answer: (A)

$6.068\times {10}^{-9}m$

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

$\lambda =\frac{6.62\times {10}^{-34}}{9.1\times {10}^{-31}\times 1.2\times {10}^5}$

$\lambda =6.062\times {10}^{-9}m$

option (A) is correct.