Suppose you look at a spectrum of visible light taken with a spectrograph on a telescope. How can you decide whether it is an emission line spectrum or an absorption line spectrum?

Which type of wave can travel without a medium

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?