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A proton and an alpha- particle are acce...

A proton and an `alpha`- particle are accelerated through the same potential difference. The ratio of de-Broglie wavelength of the proton to that of the `alpha` particle will be

A

1,alpha particles are much lighter than electrons

B

2.alpha particles are positively charged

C

3.most part of the atom is empty space

D

4.alpha particles move with high speed

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