Photoelectric emission is NOT possible at all light frequencies .
Why is photoelectric effect not possible at all frequencies?
Photoelectric emission is not possible at all frequencies because for the emission to occur there should be a minimum value of frequency related to the work function of the metal . Explore more such questions and answers at BYJU’S.
Can radiation of any frequency produce photoelectric effect?
Illumination frees electrons and holes on opposite sides of the junction to produce a voltage across the junction that can propel current, thereby converting light into electrical power. Other photoelectric effects are caused by radiation at higher frequencies, such as X-rays and gamma rays .
Is photoelectric effect can be observed for all wavelength?
A single photon, whose wavelength is lower than the threshold wavelength for a specific metal, has the required energy to eject one electron thus creating the observed photoelectric effect. Einstein used Planck’s famous expression E=hν , to explain other experimental results of photoelectric effect.
Is photoelectric effect possible at all frequencies give reasons?
Hence, we can say that photoelectric emission only occurs when the frequency of the incident radiation is greater than the threshold frequency or we can say that photoelectric emission does not occur at all frequencies .
What is the minimum energy required to remove an electron?
This term is also related with photoelectric effect as discussed in option (A), So, Work function is defined as the minimum amount of energy needed to remove an electron from the atom. So, the minimum energy required to remove an electron is called the Work function.
What is the effect of potential on photoelectric current?
For a fixed frequency, the photoelectric current increases linearly with increase in intensity of incident light . When –ve potential is applied to the plate A w.r.t. C, photoelectric current becomes zero at a particular value of –ve potential called stopping potential or cut-off potential.
What is cutoff and threshold frequency?
i) Cut-off Voltage (V0) is the minimum negative anode voltage for which the photo-current of the circuit reduces to zero. ii) For a given material, the minimum frequency of the incident frequency below which no emissions of photo-electrons occur, is called threshold frequency (ν0).
What are the laws of photoelectric emission?
The three laws of the photoelectric effect are as follows; 1) The emission of electrons from the surface stops after a certain frequency known as the threshold frequency . 2) The number of electrons that are emitted from the surface is directly proportional to the intensity of the incident light.
How does photoelectric current change with frequency of light?
At the point when intensity of incident photons increases the number of electrons produced from the surface rises because of which there is an increment in current. Current is not dependent on the frequency of photons. Frequency of photons is only related to the kinetic energy. Thus the current remains the same.
What is Einstein photoelectric equation?
: an equation in physics giving the kinetic energy of a photoelectron emitted from a metal as a result of the absorption of a radiation quantum: E k =hν−ω where E k is the kinetic energy of the photoelectron, h is the Planck constant, ν is the frequency associated with the radiation quantum, and ω the work function of the ...
What is the formula of photoelectric effect?
The photoelectric effect is the process in which EM radiation ejects electrons from a material. Einstein proposed photons to be quanta of EM radiation having energy E = hf , where f is the frequency of the radiation. All EM radiation is composed of photons.
How did Einstein prove the photoelectric effect?
In 1905, Albert Einstein published a paper advancing the hypothesis that light energy is carried in discrete quantized packets to explain experimental data from the photoelectric effect. ... A photon above a threshold frequency has the required energy to eject a single electron, creating the observed effect.
How does frequency affect photoelectric effect?
In the photoelectric effect, electrons are ejected by a metal plate when hit by photons of electromagnetic radiation . ... The shorter the wavelength (the higher the frequency), the more the energy of the photon.
Why photoelectric effect Cannot be explained?
Photoelectric effect cannot be explained on the basis of wave nature because experimentally we know that we need a particular energy called the work function of the metal surface . Unless this energy is provided, the electron won’t be ejected, irrespective of the time for which light is incident.
What is the cutoff wavelength for photoelectric effect?
The cutoff wavelength for the emission of photoelectrons from a particular surface is 500 nm . Find the maximum kinetic energy of the ejected photoelectrons when the surface is illuminated with light of wavelength 600 nm.
