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Which of the following is an example of a continuous emission spectrum?

  • A.Spectrum of an oil flame
  • B.Spectrum of water vapour
  • C.Both
  • D.None

Answer: A

The spectrum of an oil flame is a continuous emission spectrum.

Incandescent solids and liquids - the glowing soot particles in a flame, a lamp filament, molten metal - emit at every wavelength, so the spectrum shows no gaps. A gas at low pressure gives a line spectrum instead, characteristic of its atoms.

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