What is Light emission: Definition and 25 Discussions

This is a list of sources of light. Light sources include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that comes from them.

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  1. gehrenfeld

    B Exploring Infrared Light: Is It Visible to Our Eyes?

    I am 74yo and love Physics. If my basic knowledge of physics is correct, light is a photon. My question is: 1. Is the reason we cannot see infrared light because the spectrum travels at a wave link our eyes cannot see? 2. Does the light from the sun have all the different waves combined, and we...
  2. O

    Light Emission from Materials in MCNP Simulations

    Hi, I am trying to model the distribution of the light emission from a material when excited with neutrons in MCNP. I have been searching literature and found not many things. Could anyone provide me with sources from which I can get info? Thank you in advance.
  3. spareine

    Plasma ball, energy levels of neon and xenon

    I was wondering about the filament colors in a plasma ball that I have got. The main part of each filament is blue, but its end part is pink. Possibly the gas is 95% neon and 5% xenon, the pink part is light emitted by neon, and blue part light emitted by xenon. Using a hand spectroscope I...
  4. dumpling

    I Exploring the Relationship Between Light Emission and Wavefunction: An Analysis

    Hi! I would like to wrap my head around a relatively simple issue. Lets say that you have an excited atom, which rests in your refernce frame. When it emits light, the atom will have a backreaction, and it will "gain momentum" with the opposite direction as the photon. Of course, without...
  5. R

    B Understanding Black Body Radiation and the Sun's Color Temperature

    So, if frequency(max) of light emitted from an object proportional to temperature in kelvin, how can sun have max frequency around the yellow region while blue flames are much less hot?
  6. Alfredo Tifi

    I Einstein clock syncing with one way light emission absorber

    Two spaceships with their engines shut off and identical radio receiver-amplifier-reemitting devices are in the empty space, very far from each other and from any celestial body. The lag time from absorbing to reemitting in the device is vary small compared to the return time of the signal (2t)...
  7. M

    B Thermal and Non thermal light emission

    I am now working on Thermal and Non-thermal light emission of materials, particular concerning the Planck law and Generalize Planck Law. I really want to understand the fundamental concept of this. So could you please suggest me some material, book on this subject? Thank you so much in advance,
  8. A

    How are the color of an compound and it's constituent elements related?

    Suppose the color of some elements is red and blue but after the reaction between them a new compound formed with yellow color .so on what factor does the the color of compound depend? I think it may depend depend upon the number of electron transferred and the remaining one...
  9. C

    Hydrogen Emission Spectrum, Electrons, and Quantized Energy

    I understand that the result of the hydrogen emission spectrum experiment was that only certain wavelengths of light were emitted and that led to the conclusion that electrons emit light when they relax and that they absorb light when they get excited. How does that prove that the energy for...
  10. 1

    What is saturation in terms of wavelength?

    could it be possible, to make a, for example, and lens that has a special texture, or colour and putting it on would make the pictures more saturated? or maybe make a pair of glasses for people who can't produce as much cones as others? my questions is because i can't really think of it, but...
  11. Charlie Daubitz

    Understanding the Impact of Photon Emissions on the Sun's Gravity

    Do photon emissions increase the gravity of the Sun by compressing it
  12. D

    Electron recoil from light emission

    Is the Abraham-Lorentz force (Also called radiation reaction force) the only recoil experienced by an accelerating charge? Say an electron is accelerating downwards, and that a photon emitted from this electron travels right, perpendicular to the direction of motion of the electron. Does the...
  13. afcsimoes

    Trigger the emission of light by an atomic electron

    What does trigger the phenomenon of an atomic electron losing energy through the issue of a photon? (I know how an atomic electron absorbs light and changes to a more energetic level but I never read an explanation cause-effect of the inverse)
  14. S

    Light emission and energy of states

    Homework Statement The emission spectrum of thermally excited sodium atoms practically consists of a single intensive line at 589 nm wavelength. What is the energy difference (in eV units) between the excited and ground states of the sodium atom? Homework Equations E = hc/lambda, we also know...
  15. O

    Light emission from a hole in a cavity

    Homework Statement Sethna 7.7 Assume that the hole of area A is is on the upper part of the cavity, perpendicular to the z axis. The vertical component of the velocity of each photon is therefore vz= c cos(θ), where θ is the angle between the photon velocity and the vertical. The photon...
  16. C

    Can an electron emit a single photon without violating conservation laws?

    Someone told me that an electron can't emit a single photon because it would violate conservation of momentum and energy. I thought about cyclotron radiation. Let's say an electron is being bent in a B field so it starts to radiate, can't we just say that this momentum and energy came...
  17. C

    Question about light emission.

    In the Aharonov–Bohm effect when charged particles are deflected do they emit light?
  18. D

    Light emission as wire rope breaks

    I knew the one inch wire rope was under severe strain, that's why I was watching it when it parted (broke). First, a few of the individual steel wires broke with some small time interval between each break. Then more wires broke at a faster rate until the remainder broke all at once. It was...
  19. E

    Ray Type of Bulb Light Emission

    what type of ray does the bulb light emit?
  20. A

    Exploring Light Emission and Newtonian Physics

    From what I have learned so far, it appears that a light emission orthogonal to motion acts exactly like a Newtonian massive particle with conserved longitudinal momentum. Is this correct? If so it would seem to be a cosmic coincidence of monumental proportions. Having given it some...
  21. S

    Earliest time of light emission after Big Bang

    Good evening ladies and gents I'm in the process of wrapping my brain around Special Relativity, and I've come across an interesting application having to do with Cosmological Horizons. Basically, the question goes like this: "Assume a time T has passed since the Big Bang and that we are...
  22. P

    Black Holes: X-rays, Gamma Rays & Light Emission

    IF nothing can escape from a black hole's event horizon, then how do x-rays and Gamma rays escape? and how does it emits light? it says in "Brief History of Time" that the light it emits is just at the boundary of the event horizon. So then how does it escape the gravity and reach earth...
  23. B

    Time Elapsed between Light Emission and Absorption at Different Frames

    A flash of light is emitted at point O and is later reabsorbed at point P. In frame S, the line OP has a length l and makes an angle theta with the x axis. In a frame S' moving relative to S with a constant velocity v along the x axis: How much time tau' elapses between emission and absorption...
  24. K

    How do different materials produce different colored flames when burned?

    why does the burning of different materials often produce flames of different colors? I know that various colors of flames are due to excitation...but how is that applied here? Kat
  25. T

    Velocity of Light Emission: Lightspeed or More?

    Is the top speed of light emitted by something the velocity of the light emitter + lightspeed or just lightspeed?