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Explain Kirchhoffs laws or Kirchhoffs first-second-third law

Kirchhoff's laws (G.R. Kirchhoff)

Kirchhoff's first laws: An incandescent solid or gas in high pressure will generate a continuous spectrum.

Kirchhoff's second law: A low-density gas will exude an emission-line spectrum with an original emission continuum.

Kirchhoff's third law: The continuous radiation viewed via a low-density gas will generate an absorption-line spectrum.

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