Absorption and Emission Spectra Concepts

The video explains how light passing through a prism creates a spectrum of colors, a concept realized by Isaac Newton. It discusses the Fraunhofer lines, dark lines in the spectrum first observed by Joseph Von Fraunhofer. The sun's absorption spectrum is highlighted, showing how electrons absorb photons, leading to these dark lines. Each substance has a unique spectrum, akin to a fingerprint. The video concludes by contrasting absorption and emission spectrums, explaining how substances absorb or emit light at specific wavelengths.

Who first observed the dark lines in the spectrum, now known as Fraunhofer lines?

• Albert Einstein

• Isaac Newton

• Joseph Von Fraunhofer

• Niels Bohr

What causes the dark lines in the sun's absorption spectrum?

• Reflection of light

• Absorption of photons by electrons

• Refraction of light

• Emission of photons by electrons

How is each substance's spectrum similar to a fingerprint?

• It is identical for all substances

• It is unique to each substance

• It changes with temperature

• It is visible only under a microscope

What is the main difference between absorption and emission spectrums?

• Emission spectrum is only found in gases, while absorption spectrum is found in solids

• Absorption spectrum is visible, while emission spectrum is not

• Absorption spectrum shows missing wavelengths, while emission spectrum shows emitted wavelengths

• Absorption spectrum is only found in liquids, while emission spectrum is found in gases

In an absorption spectrum, what happens to the light absorbed by a substance?

• It is reflected back

• It is scattered in all directions

• It is emitted as heat

• It is absorbed and the corresponding wavelength is missing