Question

When a hydrogen atom is raised from the ground state to an excited state(a) P.E. increases and K.E. decreases(b) P.E. decreases and K.E. increases(c) Both kinetic energy and potential energy increase(d) Both K.E. and P.E. decrease

Answer 1

Explanation:

a)P.E increases and K.E decreases

Answer 2

d ) Both K.E. and P.E. decrease

Explanation:

When any atom jumps from ground state to excited state the distance from the nucleus increases. This increase in distance causes potential energy DECREASE.

The kinetic of the atoms moving from ground to excited state will decrease

from the formula:

P.E.= kZe^2/R

K.E.= 1/2MV^2 OR kZe^2/2R  (  R is the nuclear radius.)

It can be concluded from the formula that R is inversely proportional to both kinetic and potential energies, hence as hydrogen atom moves from ground to excited state the nuclear radius increases thus both K.E. and P.E. decreases.

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