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Is is true that the frequency of photons must be larger than a certain minimum value in order to eject electrons from the metal?
Wiki User
∙ 15y ago
YES.
Wiki User
∙ 15y ago
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Why are x- rays more penetrating than visible light waves?
Higher frequency photons have more energy than lower frequency photons.
How do electrons gain in energy in photosystem 1?
they absorb photons from sunlight
How can electron emit radio photon Really are photons emitted only by electrons jumping from higher to lower energy levels?
The particle-like features of EM radiation at frequencies of radio waves are almost non-existent. It is far more useful to view such radiation as a vibrating EM-field instead of a photon of almost no energy. When doing so, you can see how a EM wave would result from electrons vibrating back and forth at at set frequency. By setting up an electronic oscillator that has a resonance at a radio wave frequency, you will get electrons vibrating at that frequency; and, from that, an EM wave of that frequency. > are photons emitted only by electrons jumping from higher to lower energy levels? No, there are many other ways to accomplish this.
What is the Difference between electrons and photons?
Photons have no charge, no rest mass and travel at the speed of light throuh a vacuum. Electrons have a charge of -1, have rest mass and are part of atoms.
Where do electrons get their energy from light reactions?
From the photons is solar energy.
Are photons difficult to detect?
Generally, photons are very easy to detect. Your eyes do a good job of detecting photons within a certain frequency band, as photons constitute light and other electromagnetic radiation. Individual photons are impossible to detect with modern technology.
Does photoelectric effect take place below threshold frequency?
The threshold frequency for photoelectric emission is the smallest possible frequency a photon can have to be absorbed/emitted by an electron moving between energy levels in an atom. Explanation: Since electrons can't exist /between/ energy levels, and each electron would be moved a very specific amount by any given photon, only photons of certain frequencies can be properly absorbed/emitted, necessitating a minimum frequency.
How do you create a laser beam?
A: By applying to a laser diode pulse of current enough energy to emit photons at a certain frequency.
Do photons conduct electricity?
No. Electricity is the movement of electrons, and photons have no electrons to move. Photons are the gauge particles for the electromagnetic force, but that's a different concept.
What is the effect of frequency of incident light on photoelectric current?
The photoelectric effect is based on two principles. 1. The intensity or brightness of the visible light (number of photons): The higher the intensity (larger number of photons) determines the number of electrons that are released from the surface material. 2. The frequency of visible light (wavelength): The higher the frequency a beam of light has when it strikes the surface determines the speed (kinetic energy) of the electrons that are ejected from the material. This is independent from light intensity. The higher the frequency of the light, the higher the energy of the electrons emitted, and thus, the higher the current of the circuit.
How can you can increase or decrease the energy possessed by electrons?
Electrons can absorb photons and gain energy, and they can emit photons and lose energy.
Why are x- rays more penetrating than visible light waves?
Higher frequency photons have more energy than lower frequency photons.
Why the wave model for radiation does not account for the photoelectric effect?
Predictions of the wave model: Energy of light was dependent on the amplitude of the light wave, which was manifested as the brightness of the light. Higher amplitude (brighter) light would cause the ejected electrons to be more energetic. Colour of light was dependent on the frequency of the light but frequency had no bearing on the energy of the ejected photons. Predictions of the photon model: Both the energy of light and the colour of light was dependent on the frequency of the photons. Higher frequency would cause the the ejected electrons to be more energetic. The number of photons was manifested as the brightness of the light. Higher number of photons (brighter) light would cause the ejected electrons to be more numerous (higher current). Observations from the photoelectric effect experiment: Ejected electron energy was directly related to the frequency of the light and brighter light resulted in higher current. These observations were explained by the photon model and could not be explained with the wave model.
How do electrons gain in energy in photosystem 1?
they absorb photons from sunlight
Where do electrons get their energy in photosystem I?
From energy in photons
Are electrons moving through space called light?
Electrons are very small, and have very small mass, but they are not visible light (photons).
How can electron emit radio photon Really are photons emitted only by electrons jumping from higher to lower energy levels?
The particle-like features of EM radiation at frequencies of radio waves are almost non-existent. It is far more useful to view such radiation as a vibrating EM-field instead of a photon of almost no energy. When doing so, you can see how a EM wave would result from electrons vibrating back and forth at at set frequency. By setting up an electronic oscillator that has a resonance at a radio wave frequency, you will get electrons vibrating at that frequency; and, from that, an EM wave of that frequency. > are photons emitted only by electrons jumping from higher to lower energy levels? No, there are many other ways to accomplish this.
