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Answer 1

Explanation:

A free hydrogen atom after absorbing a photon of wavelength ___ gets excited from the state n = 1 to the state n = 4. Immediately after that the electron jumps to n = m state by emitting a photon of wavelength ___.

Let the change in momentum of atom due to the absorption and the emission are Æp_ and Æp_ respectively.

If ___/___ =1/5,which of the option(s) is /are correct ?

[Use hc = 1242 eV nm; 1 nm = 10__m, h and c are PlanckÕs constant and speed of light, respectively]

A. Æp_ =1/2

Æp_

B. The ratio of kinetic energy of the electron in the state n = m to the state n = 1 is 1/4

C. ___ =418 nm

D. m = 2