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Find the ratio of velocities of proton a...

Find the ratio of velocities of proton and `alpha`-particle if the de Broglie wavelengths of both the particles is same.

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` lambda = (h)/(m_(1) v_(1) ) = (h)/(m_(2) v_(2)) `
` therefore ` (v_(1))/(v_(2)) = (m_(2))/(m_(1)) = (4)/(1)` .
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