The de-Broglie wavelength associated with a hydrogen atom moving with a thermal

Question

The de-Broglie wavelength associated with a hydrogen atom moving with a thermal velocity of 3 km/s will be

Options:

A . 1∘A

B . 0.66∘A

C . 6.6∘A

D . 66∘A

Answer: Option B
:
B
By using

λ = \frac{h}{m v_{r m s}} \Rightarrow λ = \frac{6.6 \times 10^{- 34}}{2 \times 1.67 \times 10^{- 27} \times 3 \times 10^{3}} = 0.66 \circ A

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