![]() ![]() In that case, when the remaining radiation is passed through a prism, a spectrum is obtained with a gap in it, called an absorption spectrum. When electromagnetic radiation passes through a material, a part of the electromagnetic radiation may be absorbed. However, when atoms in their elemental form are heated or excited, the line spectra that originate are known as the atomic spectra. We know that when elements or their compounds are heated, they release energy in the form of light, which gives rise to a line spectrum. Due to the availability of multiple states of energy, an electron can undergo numerous transitions, each giving rise to a unique wavelength that comprises the emission spectrum. When the electron falls back to the lower energy level, light is emitted, which has the energy equivalent to the higher and the lower states’ energy difference. When an atom or molecule absorbs energy, the electrons are excited to a higher energy level. An example of an emission spectrum is when copper is heated on a flame, and the flame gets green color. Now let's define the line emission spectrum: a spectroscope splits the emitted light into different wavelengths and gives a discontinuous spectrum in the form of discrete lines known as a line spectrum. ![]() ![]() So, what is the emission spectrum definition in physics and chemistry? An emission spectrum is the range or array of wavelengths (spectra) obtained when the light emitted by a substance is passed through a prism and examined directly with a spectroscope. The different constituent wavelengths of white light are arranged in the spectrum in a specific order, starting with the longest wavelength (red) and shading through to the shortest ( violet). Whether it is physics or chemistry, the spectrum definition is the same - when white light is passed through a prism or any other dispersing substance, the white light splits into a series of coloured bands or lines known as a spectrum. Before we discuss the emission spectrum definition, let us address the questions - what is a spectrum in chemistry and what is a spectrum in physics. ![]()
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