High-power lasers are used to compress a plasma (a gas of charged particles) by radiation pressure. a laser generating radiation pulses with peak power 2.5 ✕ 103 mw is focused onto 1.0 mm2 of high-electron-density plasma. find the pressure exerted on the plasma if the plasma reflects all the light beams directly back along their paths.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

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