Laws of MotionHard

Question

Energy of an electron is given by E = - 2.178 × 10-18 J Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be :-
(h = 6.62 × 10-34 J-s and c = 3.0 × 108 m-s-1)

Options

A.

1.214 × 10-7 m

B.

2.816 × 10-7 m

C.

6.500 × 10-7 m

D.

8.500 × 10-7 m

Solution







∴λ= 1216 × 10-10 m
λ= 1.216 × 10-7 m

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