Question

The de Broglie wavelength of electron changes by $x$ % when it is shifted from n = 1 to n = 4. The value of $x$ % is

• A. 300%
• B. 200%
• C. 100%
• D. 50%

Answer 1

The correct option is A 300%

$\lambda =\frac{2\pi r}{n}$ (Bohr model)
$=\frac{2\pi }{n}\left(\frac{0.53n^2}{Z}\right)$
$\lambda \alpha n$