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Question

At 200oC, hydrogen molecules have velocity 2.4 × 105 cm s1. The de-Broglie wavelength in this case is approximately :

A
1 Ao
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B
1000 Ao
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C
1001 Ao
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D
10 Ao
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Solution

The correct option is A 1 Ao
λ = hmv = 6.6×1027ergs2/Na×2.4×105cms1
(mass of 1 molecule of H2 = 26.02×1023
= 6.6×1027×6.02×10232×2.4×105
= 8.27× 109 cm
= 0.8 × 108 cm = 0.8A0

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