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Why do excited atombs absorb and reemit radiation at characteristic frequencies?
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Why do excited atoms absorb and reemit radiation at characteristic frequencies?
As described by the Bohr model, the energy levels in an atom have discrete and characteristic energies. Transitions from one energy level to another correspond to emission or absorption of a photon with a characteristic energy that is exactly equal to the difference in atomic energy levels. Since the energy of a photon is defined by it’s frequency, the emitted or absorbed photons have characteristic frequencies corresponding to the difference in energy between the atomic energy levels.
Why does black absorb sunlight?
Bonds in molecules absorb light, In black the bonds absorb a lot of visible light frequencies. As black only reflects few frequencies of visible light. it gains it black colour.
Does white plastic absorb or transmit solar radiation?
White anything will REFLECT radiation, it will not transmit or absorb.
All objects emit and absorb radiant energy?
Theoretically false. An object at the temp of absolute zero would emit no energy or radiation. However, absolute zero does not exist in nature (as far as we know), therefor, in a practical sense the statement is true.
What sort of radiation absorbs or reflect radiation?
It doesn't absorb clever. It penetrates, and it can penetrate paper, smoke, a layer of skin and thin aluminium.
Why do excited atoms absorb and reemit radiation at characteristic frequencies?
As described by the Bohr model, the energy levels in an atom have discrete and characteristic energies. Transitions from one energy level to another correspond to emission or absorption of a photon with a characteristic energy that is exactly equal to the difference in atomic energy levels. Since the energy of a photon is defined by it’s frequency, the emitted or absorbed photons have characteristic frequencies corresponding to the difference in energy between the atomic energy levels.
What is the frequency of a hydrogen atom?
An atom doesn't have a frequency. It can vibrate with many different frequencies. It can absorb radiation of different frequencies under different circumstances. For instance, electrons moving between various energy levels absorb and release characteristic frequencies of visible and ultra-violet light, and in a magnetic field radio frequency energy can be absorbed as the nucleus moves from one spin state to another. Bonds between hydrogen and other atoms absorb energies in the infra red. All these things give spectra of various frequencies, not an individual frequency.
What happens to molecules if they receive electromagnetic radiation?
They are excited and their energy increases and possibly ejects an electron and change their size and shape..They will often absorb part of the radiation; in that case, their energy will increase.
Which layer of the atmosphere does not absorb solar radiation?
Troposphere does not absorb solar radiation. All other layers do not absorb.
Why oxygen and nitrogen are not greenhouse gas?
Different molecules have different characteristic vibrational frequencies for their interatomic bonds. They absorb energy that matches that frequency. The vibrational frequencies for O2 and N2 bonds don't match the main wavelengths of the energy coming from the sun or radiating back out from the earth. Water (~98 of the greenhouse effect is from water vapor) and other greenhouse gases DO have vibrational frequencies that match that energy and thus readily absorb it.
What are Two ways gases can affect radiation?
Gases absorb radiation and some is absorbed in the atmosphere :)
Do all molecules absorb infrared radiation?
No all molecules do not absorb infrared radiation. Some of them do.
Why does black absorb sunlight?
Bonds in molecules absorb light, In black the bonds absorb a lot of visible light frequencies. As black only reflects few frequencies of visible light. it gains it black colour.
Does white plastic absorb or transmit solar radiation?
White anything will REFLECT radiation, it will not transmit or absorb.
All objects emit and absorb radiant energy?
Theoretically false. An object at the temp of absolute zero would emit no energy or radiation. However, absolute zero does not exist in nature (as far as we know), therefor, in a practical sense the statement is true.
What sort of radiation absorbs or reflect radiation?
It doesn't absorb clever. It penetrates, and it can penetrate paper, smoke, a layer of skin and thin aluminium.
What measurement would you use to measure a stars elemental composition?
If you want to know the elemental composition of a star, you look for the elements' fingerprints. These are in the form of line spectra, since each element has its own particular set of spectral lines. Atoms in the star's atmosphere will absorb their characteristic frequencies from the cavity radiation emitted from the star due to its temperature. Color
