Absorption Spectra & Emission Spectrum | Chemistry for EmSAT Achieve PDF Download

• Chemistry
• Structure of Atom
• Emission Spectrum And Atomic Spectra

Emission Spectrum & Absorption Spectra

• Understanding Atomic Spectra
• Atomic spectra involves studying how atoms and atomic ions interact with electromagnetic radiation.
• Imagine light bending when it moves from one medium to another. This bending is due to the different speeds of light in those mediums.
• The speed of light changes based on the material it passes through, affecting how it behaves.
• Key Concepts of Atomic Spectra
• Atoms and their ions are studied through their interactions with electromagnetic waves.
• When light shifts between mediums, it can either bend toward or away from the normal line.
• This bending, or refraction, is due to the varying speeds of light in different substances.

Atomic spectra explores atoms and ions by observing how they respond to electromagnetic radiation.

Table of Contents

• Emission Spectrum
• Absorption Spectrum
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• Emission Spectrum & Absorption Spectrum

• Whenever electromagnetic radiation interacts with atoms and molecules of matter, the electrons in these atoms may absorb energy and jump to a higher energy state, losing their stability.
• In order to regain their stability, they need to move from the higher energy state to the previous lower energy state.
• To accomplish this job, these atoms and molecules emit radiation in various regions of the electromagnetic spectrum.
• This spectrum of radiation emitted by electrons in the excited atoms or molecules is known as an emission spectrum.

Let us understand the phenomenon of dispersion of white light through a prism. Also, learn about the emission spectrum and absorption spectrum.

Whenever electromagnetic radiation interacts with atoms and molecules of matter, the electrons in these atoms may absorb energy and jump to a higher energy state, losing their stability. In order to regain their stability, they need to move from the higher energy state to the previous lower energy state. To accomplish this job, these atoms and molecules emit radiation in various regions of the electromagnetic spectrum. This spectrum of radiation emitted by electrons in the excited atoms or molecules is known as an emission spectrum.

Whenever electromagnetic radiation interacts with atoms and molecules of matter, the electrons in these atoms may absorb energy and jump to a higher energy state, losing their stability. In order to regain their stability, they need to move from the higher energy state to the previous lower energy state. To accomplish this job, these atoms and molecules emit radiation in various regions of the electromagnetic spectrum. This spectrum of radiation emitted by electrons in the excited atoms or molecules is known as an emission spectrum.

Absorption Spectrum

• When white light passes through a prism, it bends or refracts twice, first entering the glass from air and then leaving the glass back into air.
• This double refraction results in the formation of a spectrum, which is a band of colors seen in white light.
• On close observation of this spectrum, it becomes evident that colors with shorter wavelengths, like violet, bend more than colors with longer wavelengths, such as red.
• Consequently, we see a continuous range of colors from red to violet, with red experiencing the least amount of bending due to its longer wavelength.
• This continuous transition from one color to the next is known as a continuous spectrum. For instance, violet smoothly transitions into blue, blue into green, and so forth.

Continuous Spectrum

• Contrary to the continuous spectrum observed in natural white light, the emission spectrum of atoms in a gaseous state does not display a continuous spread of colors.
• Instead, the emitted light consists of specific wavelengths with distinct dark gaps between them.
• This unique pattern is referred to as atomic spectra or line spectra.

Emission Spectrum & Absorption Spectrum

• Emission Spectrum: An emission spectrum is unique to each element and is like a fingerprint of light emitted when an electron moves from a higher energy level to a lower one.
• Absorption Spectrum: This is essentially the reverse of an emission spectrum, seen as dark lines in a continuous spectrum when certain wavelengths of light are absorbed by a substance.
• When observing the absorption spectrum, electromagnetic radiation is directed at a sample, which then absorbs specific wavelengths of this radiation.
• The absorbed wavelengths create gaps in the otherwise continuous spectrum, resulting in dark lines where this absorption occurs.
• Each element has its distinct line emission spectrum, and the study of these spectra falls under the realm of spectroscopy.

To delve deeper into the concept of emission and absorption spectra, you can explore resources like EduRev - The Learning Platform.

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Choose the correct answers and hit 'Finish' to end the quiz. Review your score and responses at the conclusion of the assessment.

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