Q155 / 180 · COMEDK 2018 · Physics

Hydrogen atom does not emit X-rays because

A
it contains only a single electron
B
energy levels in it are far apart
C
its size is very small
Correct answer
D
energy levels in it are very close to each other

Solution

Hydrogen atom does not emit X-rays because its energy level are very close to each other. Hence, the transition of electron emits high energy radiations having short wavelength.

Hence, the correct answer is option: 'D'.

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