Why does photoelectric emission not take place if the frequency?
So, if the frequency of incident radiation is less than threshold frequency of the metal because of this no electrons have released from the atom as electron gas contains no kinetic energy or not enough kinetic energy to dislodge an electron from the atom or metal piece.
Why does photoelectric emission not take place if the frequency of incident radiation is less than threshold frequency?
When the frequency of incident radiation becomes equal to threshold frequency, the blue of stopping potential becomes zero. When the frequency of incident radiation becomes less than threshold frequency no photoelectric emission take place. Hence, the involvement of stopping potential does not arise.
Why does the photoelectric effect not occur if the frequency of the light is below some threshold value?
The frequency corresponding to this minimum energy is known as the threshold frequency. So, without reaching threshold frequency, it is not possible to eject an electron i.e. Can’t observe photoelectric effect.
How does the photoelectric effect prove that light is a particle and not just a wave?
Photoelectric effect occurs when a high energy photon (light particle) strikes a metal surface and an electron is ejected while the photon disappears. This shows that light can be a particle AND a wave.
What is cutoff and threshold frequency?
Dual Nature of Radiation and Matter i) Cut-off or stopping potential is that minimum value of negative potential at anode which just stops the photo electric current. ii) The minimum frequency of light below which no photo electric emission will take place is known as threshold frequency.
Is photo emission possible at all frequencies?
Photoelectric emission is NOT possible at all light frequencies.
In which of the following emission of electrons does not take place?
In the case of X-rays emission, high speed electrons that are often emitted from a filament strike a copper target to emit X-rays. Thus in X-rays the emission of electrons does not take place.
When the frequency of the incident light is less than the threshold frequency Mcq?
Solution: When the frequency of incident light is halved of its original value i.e. 1.5v0 then it becomes less than the threshold value. In that case no photoelectric effect takes place.
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.
How does photoelectric effect prove light is particle?
The photoelectric effect supports a particle theory of light in that it behaves like an elastic collision (one that conserves mechanical energy) between two particles, the photon of light and the electron of the metal. The energy before the collision is hν .
How does photoelectric effect prove particle?
The photoelectric effect proves that light has particle-like activity. The photoelectric effect happens when photons are shone on metal and electrons are ejected from the surface of that metal. The electrons that are ejected are determined by the wavelength of light which determines the energy of photons.
How does photoelectric effect prove particle nature?
The photoelectric effect supports a particle theory of light in that it behaves like an elastic collision (one that conserves mechanical energy) between two particles, the photon of light and the electron of the metal. However much hν exceeds the binding energy will be the kinetic energy KE of the ejected electron.
Why does photoelectric emission not take place if frequency of incident radiation?
Why does photoelectric emission not take place if the frequency of incident radiation is less than threshold value? If the frequency of incident radiation is less than the threshold value (), the K.E. of emitted electron is nagative i.e. photoelectric emission will not take place, no matter how large is the intensity of the incident radiation.
What is Einstein’s interpretation of the photoelectric effect?
Einstein’s interpretation of the photoelectric effect results in equations which are valid for visible and ultraviolet light: No electron will be emitted if the incident photon’s energy is less than the work function. where m is the rest mass of the particle and c is the velocity of light in a vacuum.
What is νν and W in photoelectric effect?
ν is the frequency of the incident photon. W is the work function, which is the minimum energy required to remove an electron from the surface of a given metal: hν 0. E is the maximum kinetic energy of ejected electrons: 1/2 mv 2. ν 0 is the threshold frequency for the photoelectric effect.
What is the threshold frequency for photoelectric effect to occur?
For a given metal, there is a minimum frequency of incident radiation below which the photoelectric effect will not occur, so no photoelectrons can be emitted (threshold frequency).