The cutoff frequency is
the minimum frequency that is required for the emission of electrons from a metallic surface
, due to incident radiation. Below the cutoff frequency, the phenomenon of the photoelectric effect stops altogether.
What is the incident radiation?
What is incident radiation. The incident radiation is
the electromagnetic radiation that is being used to eject the electrons in the metal
. Another way to remember this is that the incident radiation is the “incoming” light that will strike the specific surface you are examining.
Which stop as soon as the incident radiation is cut off?
If the
luminescence
immediately stops when the exciting radiation is cut off, it is fluorescence; if the luminescence continues, it is phosphorescence. The detector is usually placed perpendicular to the path of the incident radiation in order to eliminate the possibility of monitoring the incident radiation.
What is the effect of intensity of incident radiation on the kinetic energy of the photoelectron?
However, if just the intensity of the incident radiation is increased,
there is no effect on the kinetic energies
of the photoelectrons. For a given metal and frequency of incident radiation, the rate at which photoelectrons are ejected is directly proportional to the intensity of the incident light.
How does the stopping potential of a photosensitive material vary with the intensity of incident radiation?
Stopping potential
does not depend
on the intensity of incident light. On increasing intensity, the value of saturated current increases, whereas the stopping potential remains unchanged. Stopping potential does not depend on the intensity of incident radiation.
Does stopping potential depends on frequency?
The stopping potential does not depend on the intensity nor the number of incident photons but the stopping potential depends on
the frequency of the incident light
, the higher the frequency of the incident light higher the stopping potential or cut potential. It also depends on the kinetic energy of the electrons.
How is cut-off frequency calculated?
We can write the cutoff frequency equation for RC filter circuit as:
f
c
= 1 / (2 * π * R * C )
.
What is the percentage of reflected radiation to the incident radiation?
No material surface absorbs all of the radiation incident upon it. Even lampblack reflects
about 1% of the incident radiation
. In practice, a perfectly black surface can be most closely approximated by a very small opening in the wall of a large cavity such as the one shown schematically in Figure 25.6.
What is difference between radiation and irradiation?
The main difference between radiation and irradiation is that the term
radiation
refers to many different processes of transferring energy including the transfer of energy via electromagnetic waves or the emission of particles during nuclear decay, whereas irradiation refers more specifically to the process by which an …
What are the components of incident radiation?
Radiation that is not absorbed or scattered in the atmosphere can reach and interact with the Earth’s surface. There are three (3) forms of interaction that can take place when energy strikes, or is incident (I) upon the surface. These are:
absorption (A); transmission (T); and reflection (R).
What happens to the photoelectrons when intensity of incident radiation is increased?
If the intensity of radiation is increased, keeping the frequency fixed,
the number of photons per second will increase leading to more collisions per second and transfer of photon energy to more electrons
. Thus the number of electrons coming out per second will increase leading to increase in photocurrent.
What is the effect of intensity of light?
If the frequency of electromagnetic waves is higher than the extraction threshold of the metal and electrons are emitted from the metal surface, then an increase of light intensity will result in
a proportional increase of electrical current of the electrical circuit where the emitted electrons are conveyed
.
Does photocurrent depend on intensity?
A.
Depends both on intensity and frequency of the incident light
. Does not depend on the frequency of incident light but depends on the intensity of the incident light. …
What is dual nature of radiation?
Light and other electromagnetic radiations have dual nature viz:
the particle nature and the wave nature
. Wave Nature of Radiations: Radiation is the form of energy, which can be transferred from one point to another point in space. … Distance travelled by the wave in one second is called the velocity of the wave.
Does diffraction show dual nature of radiation?
Radiations show both particle and wave nature and hence have a
dual nature
. … This effect depicts radiations as a packet of energy or a particle having one phonon energy. Hence the properties of photoelectric effect and diffraction explain the dual nature of radiation. Therefore, the correct option is D.
What is the dual nature of matter?
According to the de Broglie concept of matter waves, the matter has dual nature. It means
when the matter is moving it shows the wave properties
(like interference, diffraction etc.) are associated with it and when it is in the state of rest then it shows particle properties. Thus the matter has dual nature.
