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A photon is simply a packet of electromagnetic energy on the move. Since we detect this energy as it comes from across the vacuum of space, we must conclude that they exist in the free vacuum. A photon (as it travels) does not need to react with
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The cosmic microwave background radiation is thermal radiation that was originally emitted at much higher frequency corresponding to a relatively warm 380,000 year old universe (3000 K). Since then, the universe has expanded, stretching the photons'
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Photons have energy E = h nu = h c/lambda (nu frequency, c speed of light, lambda wavelength, h Planck's constant) But E = mc2 So m = h/(lambda c) Photons do have mass and are affected by gravitational fields. Astronomers use this in what is called "
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Answer A: Photons don't really change direction instantly. Photons themselves do not accelerate (they have no mass, and always travel at the speed of light). Electrons inside the reflecting material are accelerating as a result of the incident
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The speed of light and, thus, photons is constant in any given medium. The speed of photons is greatest in a vacuum or free-space but less in air and water etc. The wavelength of a photon 'λ' times its frequency 'f' gives its speed 'c': - c= λ.f
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Stimulated emission is really a quantum mechanical phenomenon but it can be understood in terms of a "classical" field and a quantum mechanical atom. Electrons and how they interact with each other and electromagnetic fields form the basis for most
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(a) The different colors of light passing through the filters have different energies or frequencies. In our experiment red and green light were much less effective in causing the reaction than blue or yellow light. Photons of blue or yellow light
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The response to the question related to photons obeying the laws of classical mechanics is No, photons are quantum objects and because of that they are correctly described by the laws of quantum mechanics, or more precisely by the laws of QED (
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Tachyon energy are subatomic particles of light that travel faster than light. Photons are quantum packets of light carrying energy, they move faster than light A demonstrate particle & wave properties (ie, moving in straight lines as well as in
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The energy of the photons is equal to (Planck's constant times the speed of light) divided by wavelength.
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