A particle of mass \( M \) at rest decays into two particles of mas...

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A particle of mass \( M \) at rest decays into two particles of masses \( m_{1} \) and \( m_{2} \), having non-zero velocities. The ratio of the
\( \mathrm{P} \) de-Broglie wavelengths of the particles, \( \lambda_{1} / \lambda_{2} \), is :
(A) \( m_{1} / m_{2} \)
(B) \( m_{2} / m_{1} \)
(C) \( 1.0 \)
(D) \( \sqrt{m_{2} / m_{1}} \)
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