First slide

Bohr Model of the Hydrogen atom.

Question

When an electron jumps from a level n = 4 to n = 1, the momentum of the recoiled hydrogen atom will be

Moderate

A

6.5 x 10^–27 kgms^–1
B

12.75 x 10^–19kgms^–1
C

13.6 x 10^–27 kgms^–1
D

Zero

Solution

$P_{H - atom} = P_{photon}; = \frac{h}{λ} = h [{RZ}^{2} (\frac{1}{{n_{1}}^{2}} - \frac{1}{{n_{2}}^{2}})] = 6.6 x 10^{- 34} [10^{7} {(1)}^{2} (\frac{1}{1})]$

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