At 200oC, hydrogen molecules have velocity 2.4 × 105 cm s−1. 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 = 6.6×10−27ergs2/Na×2.4×105cms−1 (mass of 1 molecule of H2 = 26.02×1023 = 6.6×10−27×6.02×10232×2.4×105 = 8.27× 10−9 cm = 0.8 × 10−8 cm = 0.8A0