Question

A particle of mass ${10}^{-31}$ kg is moving with a velocity equal to ${10}^{5}m{s}^{-1}$. The wavelength of the particle is equal to:

• A. $6.6\times {10}^{-8}cm$
• B. $0.66\times {10}^{-8}cm$
• C. $6.6\times {10}^{-8}m$
• D. $10cm$

Answer 1

The correct option is C $6.6\times {10}^{-8}m$

We know that

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

$\lambda =\frac{6.63\times {10}^{-34}}{{10}^{-31}\times {10}^5}$

$\lambda =6.6\times {16}^{-8}m$

So, the answer is option (C).