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# The velocities of two particles $\underline {A}$ and $\underline {B}$ are $00.05$ and $0.02\;ms^{-1}$ respectively. The mass of $\underline {B}$ is five times the mass of $\underline {A}$. The ratio of their de Broglie's wavelength is

$\begin {array} {1 1} (1)\;2:1 & \quad (2)\;1:4 \\ (3)\;1:1 & \quad (4)\;4:1 \end {array}$
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(1) 2:1
answered Nov 7, 2013 by

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