Which of the following is the approximate wavelength of electronic motion in Bohr's first orbit of a uni-electron species if its velocity is 3 × 106 ms-1? (h = 6.6 ×10-34 kg m2 s-1)

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224 pm

242 pm

422 pm

445 pm

answer is B.

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Detailed Solution

λ=hmv=6.6×10-34 kg m2 s-19.1×10-31 kg×3×106 ms-1 =6.69.1×3×10-9 m=242×10-12 m=242 pm

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