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It doesn't, and that's the whole big mysterious fact about the photoelectric effect
that was standing Physics on its ear about 100 years ago. It doesn't matter how
bright the light is, there's no photoelectric effect if the light is below the threshold
frequency. And if it's above the threshold frequency, it doesn't matter how dim the
light is, those electrons come streaming off of the surface of the target.
What else can I help you with?
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.
Does photoelectric effect take place below threshold frequency?
No, the photoelectric effect only occurs when the frequency of incident light is equal to or greater than the threshold frequency. Below the threshold frequency, photons do not possess enough energy to eject electrons from a 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 is threshold frequency?
Threshold frequency is the minimum frequency of light required to eject electrons from a metal surface in the photoelectric effect. Below this frequency, no electrons are emitted regardless of intensity. It is a characteristic property of each metal and is used to determine the work function of the metal.
What is threshold wavelength?
Threshold wavelength refers to the minimum wavelength of light required to start a specific phenomenon, such as photoelectric effect or emission of electrons from a metal surface. Below this threshold wavelength, the desired effect does not occur.
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.
Does photoelectric effect take place below threshold frequency?
No, the photoelectric effect only occurs when the frequency of incident light is equal to or greater than the threshold frequency. Below the threshold frequency, photons do not possess enough energy to eject electrons from a 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 is threshold frequency?
Threshold frequency is the minimum frequency of light required to eject electrons from a metal surface in the photoelectric effect. Below this frequency, no electrons are emitted regardless of intensity. It is a characteristic property of each metal and is used to determine the work function of the metal.
How did Einstein used Plank' theory to explain the existence of threshold frequency?
Einstein used Planck's theory of quantization to explain the photoelectric effect by proposing that light is quantized into packets of energy called photons. These photons have energy proportional to their frequency, and when light with frequency below the threshold frequency interacts with a metal surface, no electrons are emitted. Above the threshold frequency, each photon can transfer enough energy to overcome the work function of the metal, causing electrons to be emitted.
What is threshold wavelength?
Threshold wavelength refers to the minimum wavelength of light required to start a specific phenomenon, such as photoelectric effect or emission of electrons from a metal surface. Below this threshold wavelength, the desired effect does not occur.
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 there is a cutoff requency in the photoelectric effect?
In any circumstance where a threshold of energy is required to free an electron from a bound state, an incoming photon must have at least that energy to do the job. The energy of a photon is proportional to the frequency of the light, so the minimum energy corresponds to a minimum frequency of the light, or maximum wavelength necessary to free an electron. This observation was a major step in the development of radiation theory (Einstein).
Why does the existence of a cutoff frequency in the photoelectric effect favor a particle theory of light rather than a wave theory?
According to the wave theory, light of any frequency can cause electrons to be ejected as long as the light is intense enough. A higher intensity corresponds to a greater electric field magnitude and more energy. Therefore, there should be no frequency below which the photoelectric effect does not occur. According to the particle theory, however, each photon carries an amount of energy that depends upon its frequency. Increasing the intensity of the light increases the number of photons but does not increase the energy of the individual photons. The cutoff frequency is that frequency at which the energy of the photon equals the work function. If the frequency of the incoming light is below the cutoff, the electrons will not be ejected because no individual photon has enough energy to impart to an electron.
What is the lowest natural frequency of sound is?
The lowest natural frequency of sound is around 20 Hz, which is the lower limit of human hearing. Frequencies below this threshold are considered infrasound.
What is the measurement of the quietest sound that can be heard by humans?
The threshold of hearing, or the quietest sound humans can hear, is typically around 0 decibels (dB) at a frequency of 1,000 hertz. Sounds below this threshold may not be perceivable by the human ear.
What are the laws of photoelectric effect?
1 photoelectric current is propotional to the intensity of incident light 2 for a given material their exist a certain minimun frequency of light so that photoelectron can be ejected 4m metal surface. 3 the rate at which electron r emitted 4m a photo cathode i impedent of its temp. 4 time tag bet. the incident radiations and the emission of electron is less than 10 to power (-ve) 8.
