What serves as the "excitation source" for the electrons in the mercury and the hydrogen atoms?

plase see the answer below

Explanation:

Hydrogen atoms demands energy of the order of 13.eV for excitation of electrons, this energy is the energy of infrared photons.

Mercury demands an energy of the order of 4.9 eV. This also corresponds to microwaves photons.

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1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)