An electron is travelling with a velocity $v$ in free space and when it enters a medium,its velocity is reduced by $20\%$. The de Broglie wavelength of electron in the medium is $\alpha\lambda_0$,where $\lambda_0$ is its de Broglie wavelength in free space. The value of $\alpha$ is . . . . . . .
- A$1.2$
- B$1$
- C$1.25$
- D$0.75$
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