1.

If the velocity of hydrogen molecule is \[5\times {{10}^{4}}cm\,se{{c}^{-1}}\], then its de-Broglie wavelength is                 [MP PMT 2003]

A. \[2\text{ }{AA}\]
B. \[4{AA}\]
C. \[8{AA}~\]
D. \[100\text{ }{AA}\]
Answer» C. \[8{AA}~\]


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