At what temperature, is the root mean square \( \mathrm{P} \) veloc...

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At what temperature, is the root mean square
\( \mathrm{P} \) velocity of gaseous hydrogen molecules equal to

W that of oxygen molecules at \( 47^{\circ} \mathrm{C} \)
(1) \( 20 K \)
(2) \( 80 K \)
(3) \( -73 K \)
(4) \( 3 K \)
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