At which temperature the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at $47^{\circ} \mathrm{C}$ ?
  • A $80 \mathrm{~K}$
  • B $-73 \mathrm{~K}$
  • C $4 \mathrm{~K}$
  • D $20 \mathrm{~K}$
JEE MAIN 2024, Diffcult
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