atomic spectra

Question 1

Which Postulate of Bohr’s Model of the hydrogen atom contradict with classical physics?

Answer 1

1st Postulate contradicts with classical physics.

Question 2

The metastable state for an atom in laser light is

Answer 2

The Meta stable state for an atom in laser light is 10-3 s. This state is much longer than the excited state.

Question 3

The ratio of kinetic energy and the total energy of the electron in the hydrogen atom is

Answer 3

1 : -1

Question 4

Hydrogen atom does not emit X-rays because

Answer 4

its energy levels are too close to each other

For hydrogen atom the energy levels in it are very close to each other because of which the transition of electron emits high energy radiations having short wavelengths. Therefore for shortest distance i.e. Lyman series the wavelength obtain in ultra-violet region. Since, X-rays are long radiation photons, hydrogen atom does not emit X-rays.