Atomic electrons have specific allowed energy
If atoms occupy only certain allowed levels, how
do they get from one allowed level to another?
Why do atoms emit or absorb only certain specific
colors of light?
How can you tell that there is calcium in the atmosphere
of the star Betelgeuse, which is about 310 light years
away from the earth?
How does the Schrodinger equation give insight
into the building of the periodic table?
What is a laser?
What are the characteristic properties which make
the light from a laser unique?
What is a hologram? What properties distinguish a
hologram from an ordinary photograph?
Why is it that you are transparent to radio waves,
more and more opaque as the frequency increases
to the visible and ultraviolet part of the spectrum,
and then suddenly transparent again when you get
to the xray part of the electromagnetic spectrum?
Why do you say that ultraviolet exposure might involve
some risk of skin cancer, whereas exposure from your
microwave oven carries no such risk?
What types of radiation make up the ionizing radiation
which we might be exposed to?