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A molecule of `O_(2)` and that of `SO_(2)` travel with the same velocity. What is the ratio of their wavelengths ?

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`lamda_(O_(2))//lamda_(SO_(2)) = 2` (because `lamda = (h)/(mv) " i.e., " lamda prop (1)/(m)` and mass of `SO_(2)` molecule viz. 64 u, is double than that of `O_(2)` molecule viz. 32 u)

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