Glowing hydrogen gas has four visible spectral "lines." these are produced when the electron in the hydrogen atom makes transitions to the energy level labeled e2 figure 2.9. find the wavelengths associated with the transitions that produce the four visible wavelengths.

coil wire, increase current, put iron inside the coil

i think the answer is a, hope this : )

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

the answer to this is proletariats.

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