When an electron of an atom returns from an excited state to the ground state, it emits energy in the form of a photon. how does the change in energy level compare to the energy of the emitted photon?

a. it is less than the energy of the photon.
b. it is about one third the energy of the photon.
c. it is exactly half of the energy of the photon.
d. it is equal to the energy of the photon.
e. it is exactly twice the energy of the photon.

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

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