Why are some wavelengths emitted but not absorbed?

Explanation: The electrons in an atom can only occupy certain allowed energy levels. Conversely, an atomic electron can be promoted to a higher energy level when it absorbs a photon. Again because only certain transitions are allowed, only certain wavelengths can be absorbed.

Do higher wavelengths absorb more light?

The maximum absorption is moving to longer wavelengths as the amount of delocalization increases. Therefore maximum absorption is moving to shorter frequencies as the amount of delocalization increases….Why is beta-carotene orange?

color region	wavelength (nm)
red	625 – 740

Why the emitted light has lower energy than the one absorbed in fluorescence spectroscopy?

Because the energy associated with fluorescence emission transitions (see Figures 1-4) is typically less than that of absorption, the resulting emitted photons have less energy and are shifted to longer wavelengths.

Why do atoms emit or absorb light of specific wavelengths How does this fact allow us to determine the chemical composition of a distant object?

Why do atoms emit or absorb light of specific wavelengths? They correspond to particular energy level transitions in atoms or molecules. Every kind of atom, ion, and molecule produces a unique set of spectral lines, so we can determine an object’s composition by identifying these lines.

Why do wavelengths of absorption and emission lines match?

Because the energy levels in an element’s atoms are fixed, the size of the outward jumps made by the electrons are the same as the inward jumps. Therefore, the pattern of absorption lines is the same as the pattern of emission lines.

Why does one wavelength have a higher scattering than the other wavelength?

Apparently, it is possible for a photon to get deflected or scattered when it runs into something (i.e. a molecule) that is significantly smaller than its wavelength. This means that the smaller the wavelength, (or the higher the frequency of light), the more scattering takes place.

Which wavelength of light is best absorbed by chlorophyll?

A type of chlorophyll that is most common and predominant in all oxygen-evolving photosynthetic organisms such as higher plants, red and green algae. It is best at absorbing wavelength in the 400-450 nm and 650-700 nm of the electromagnetic spectrum.

Why the wavelength of fluorescence emission is longer than the wavelength of excitation?

Since wavelength is inversely proportional to radiation energy ( ), the energy loss shifts the emission spectrum to longer wavelengths than the excitation spectrum.

What does the energy of the absorbed and/or emitted photon depend on?

The energy of the emitted electrons does not depend on the intensity of the incoming light (the number of photons), only on the energy or frequency of the individual photons. It is strictly an interaction between the incident photon and the outermost electron.

Why do substances absorb certain wavelengths?

So the selective absorption of light by a particular material occurs because the frequency of the light wave matches the frequency at which electrons in the atoms of that material vibrate. Absorption depends on the state of an object’s electron.

Why do atoms emit or absorb specific wavelengths of light quizlet?

Why do atoms emit or absorb light of specific wavelengths? They correspond to particular energy level transitions in atoms or molecules.

Why can only certain wavelengths of light be emitted?

Explanation: Only certain energy levels are allowed, so only certain transitions are possible and hence specific wavelengths are emitted when an electron drops to a lower energy level. Conversely, an atomic electron can be promoted to a higher energy level when it absorbs a photon. Again because only certain transitions are allowed,…

Why do different pigments absorb different wavelengths of light?

In fact, this is why different pigments absorb different wavelengths of light: the “energy gaps” between the orbitals are different in each pigment, meaning that photons of different wavelengths are needed in each case to provide an energy boost that matches the gap 4.

What happens to light absorbed by an electron in fluorescence?

In fluorescence, light is absorbed in phosphors. This excites electrons to some upper level, but on the way down to a lower level, the electron may emit several photons. Some of the energy may simply be absorbed as heat. You are likely to see some photons come out at longer wavelengths.

What is the relationship between frequency and energy of light waves?

Light waves with shorter wavelengths have higher frequency and higher energy. Light waves with longer wavelengths have lower frequency and lower energy. The visible light spectrum. An excited fluorophore molecule emits lower-energy light than the light it absorbs.