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What is the phenomenon in which electrons are emitted from a metals surface when light of a certain frequency shines on it?
Photoelectric phenomenon
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Why for a particular metal electrons are emitted only when the frequency of the incident radiation is greater than a certain value?
Electrons are emitted from a metal surface when the energy of the incident photons is great enough to overcome the work function of the metal. This minimum energy required is equivalent to a certain threshold frequency, known as the threshold frequency. Electrons can only be emitted when the frequency of the incident radiation is greater than this threshold frequency because lower frequency photons do not possess enough energy to overcome the work function and release electrons from the metal surface.
What 3 experimental facts about the photoelectric effect could only be explained by the idea of atoms absorbing photons of lights of a certain energy?
The existence of a threshold frequency below which no electrons were emitted. The direct proportionality between the frequency of incident light and the kinetic energy of emitted electrons. The instantaneous emission of electrons once the threshold frequency was surpassed, rather than a delayed response as would be expected in a classical wave model.
Why the kinetic energy of the emitted electrons varies up to a maximum value?
Let the work function of a metal be W. Let C be a constant of the dimension of energy. if Kis the maximum kinetic energy of an electron then.......W=C-K..... (K HERE IS THE ENERGY SUPLIED BY A PHOTON TO THE ELECTRON)
What is the frequency of Beta radiation?
The frequency of beta radiation can vary depending on the specific beta particle emitted, but typically ranges from about 10^18 to 10^20 Hz. Beta particles are high-energy electrons or positrons that are emitted during certain types of radioactive decay.
Use Einstein photoelectric equation to explain Why for a particular metal electrons are emitted only when the frequency of the incident radiation is greater than a certain value?
The photoelectric effect occurs when photons with sufficient energy strike a metal surface, causing electrons to be emitted. According to the Einstein photoelectric equation, the energy of the emitted electron is equal to the energy of the incident photon minus the work function of the metal. Therefore, only photons with energy greater than the work function of the metal can overcome the binding energy of the electrons and cause emission. This is why electrons are emitted only when the frequency (or energy) of the incident radiation is greater than a certain value.
What happens to electrons if photon frequency is below threshold?
If the photon frequency is below the threshold frequency, the electrons do not have enough energy to be emitted from the material's surface, and no photoelectric effect occurs. The electrons will not be ejected and will remain bound to the material.
What is the relationship between maximum frequency and maximum kinetic energy in photoelectric effect?
In the photoelectric effect, the maximum kinetic energy of emitted electrons is directly related to the frequency of the incident light. According to Einstein's photoelectric equation, the maximum kinetic energy (K.E.) of the electrons is given by ( K.E. = hf - \phi ), where ( h ) is Planck's constant, ( f ) is the frequency of the light, and ( \phi ) is the work function of the material. As the frequency increases, the maximum kinetic energy of the emitted electrons also increases, provided the frequency exceeds the threshold frequency necessary to release electrons. Thus, higher frequencies lead to greater maximum kinetic energies of the emitted electrons.
What is photoelectric emission effect?
The photoelectric emission effect is a phenomenon where electrons are emitted from a material when it is exposed to light, typically of high enough frequency (i.e., energy) to cause electrons to be ejected from the material's surface. This effect is important in technologies like solar cells and photomultiplier tubes.
What is the frequency in photoelectric effect?
In the photoelectric effect, the frequency of incident light determines the energy of the ejected electrons from a material. Electrons are only emitted from the material when the frequency of the incident light is greater than the threshold frequency, which is unique to each material.
Why the graph paper of photoelectric effect does not begin from the origin?
The graph paper for the photoelectric effect does not begin from the origin because there is a threshold frequency required to eject electrons. Below this threshold frequency, no electrons are emitted, so there is a minimum value on the x-axis. Electrons are only emitted once the incident light reaches a certain energy level (threshold), causing the emission of electrons. This energy level is depicted by the non-zero intercept on the x-axis of the graph paper.
What does light do in photoeletric effect?
In the photoelectric effect, light (photons) ejects electrons from a material's surface, creating an electric current. The energy of each photon must exceed the material's work function for electrons to be emitted. The intensity of light affects the number of electrons emitted, while the frequency determines the kinetic energy of the emitted electrons.
Why is it not possible to get electrons from metal even when light of high frequency fall on its surface?
High-frequency light can cause electrons to be emitted from a metal's surface through the photoelectric effect. However, if the energy of the photons is still not high enough to overcome the metal's work function (the minimum energy needed to release an electron), then electrons cannot be emitted.
