MCQ
How fast is an electron moving if it has a wavelength equal to the distance it travels in one second ?
- ✓$\sqrt {\frac{h}{m}}$
- B$\sqrt {\frac{m}{h}}$
- C$\sqrt {\frac{h}{p}}$
- D$\sqrt {\frac{h}{2(KE)}}$
$\lambda=\frac{h}{m v}$
But $v ^{2}=\frac{h}{m}$
By putting this in the equation, we get
$\lambda=\sqrt{\frac{h}{m}}$
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