Question

The mass of two substances are 4gm and 9gm respectively. If their kinetic energies are same, then the ratio of their momenta will be

Moderate

Solution

$P = \sqrt{2 mE} \Rightarrow \frac{P_{1}}{P_{2}} = \sqrt{\frac{m_{1}}{m_{2}}} = \sqrt{\frac{4}{9}} = \frac{2}{3}$

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