Light frequency and the threshold frequency ν0
We can think of the incident light as a stream of photons with an energy determined by the light frequency. When a photon hits the metal surface, the photon’s energy is absorbed by an electron in the metal.
Similarly, What is the frequency of the incident radiation on a metallic plate?
ϕ(eV) 2.4. 2.3. 2.2.
Additionally, When the frequency of the incident light is less? 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.
What is meant by threshold frequency?
: the minimum frequency of radiation that will produce a photoelectric effect.
What is the difference between frequency and intensity of light?
Answer: Light is electromagnetic radiation and exhbits dual nature, wave and particle. if you consider light is wave, intensity is related to light radiation energy and frequency is the number of waves per second. … In particle nature, intensity is related to number of photons in the radiation.
When the frequency of the incident radiation on a metallic plate is doubled kinetic energy of the photoelectrons will be?
Ans. (1) If the frequency of the incident radiation is doubled (hv – hv0) is increased, hence kinetic energy is increased. (2) If the frequency of the incident radiation is doubled there will be no change in the number of photoectrons i.e. photoelectronic current.
When the frequency of light incident on a metallic plate is doubled the key of the emitted photoelectrons will be?
When the frequency of light incident on a metallic plate is doubled, the maximum kinetic energy of emitted photoelectrons will be: halved.
When the frequency of incident radiation on a metallic plate is doubled Ke of the photoelectrons will be?
The kinetic energy of photo-electrons increases with increase in frequency of incident light where v>v0.
What happens if the frequency of the incident light is increased?
If the frequency of the incident wave is increased, then the kinetic energy of the photoelectrons increases.
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.
When frequency of incident photon is less than the threshold frequency photoelectric current is?
Q. Assertion The threshold frequency of photoelectric effect supports the particle nature of sunlight Reason If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.
What is meant by threshold frequency in physics?
Threshold frequency: Threshold frequency is the minimum frequency of the incident radiation below which photoelectric emission is not possible irrespective of the intensity of the incident radiation. …
What is mean by threshold frequency in photoelectric effect?
Threshold frequency in photoelectric effect is the minimum frequency of electromagnetic radiation which is required for the phenomenon of photoelectric emission to occur from a metal surface. It is a characteristic of electromagnetic radiation (light in case of photoelectric emission) and not metal.
What is meant by threshold value?
[′thresh‚hōld ‚val·yü] (computer science) A point beyond which there is a change in the manner a program executes; in particular, an error rate above which the operating system shuts down the computer system on the assumption that a hardware failure has occurred.
What is the meaning of frequency and intensity?
Frequency is how often you exercise. Usually we measure this by number of days each week. Intensity is how hard your exercise. We might categorize this as low, moderate, or high intensity. … Type refers to what kind of exercise you are doing.
What is difference between intensity and frequency of sound?
Sounds can be described in two ways, by their frequency (or pitch), and by their intensity (or loudness). Frequency (the number of vibrations or sound waves per second) is measured in Hertz (Hz). … Intensity (loudness) is the amount of energy of a vibration, and is measured in decibels (dB).
What is the difference between intensity and energy of light?
The Energy of light (electromagnetic radiation) is calculated using the equation . The intensity of light, when defining light as a particle is the number of photons present at any given time. When light is defined as a wave the intensity is the square of the amplitude ( ).
What happens when the intensity and frequency of light incident on a photoelectric surface is doubled?
The intensity of the light is doubled. What happens to the kinetic energy of the electrons? … Halving the wavelength doubles the frequency and, thus, doubles the energy of the incident photons. This doubles the energy given to each electron, nearly doubling its kinetic energy after it is free from the metal.
How does the photoelectric current in a photocell will change if the frequency of incident light is doubled?
Answer: (i) The K.E. of the photoelectron becomes more than double of its original energy. … (iii) With the increase in frequency, the K.E. of the photoelectron increases, so stopping potential also increases.
When the frequency of the incident light is less than the 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.
What will happen to photocurrent IF frequency of incident light is doubled keeping intensity constant?
The saturation photocurrent remains almost the same <br> B. The maximum kinetic energy of the photoelectrons is double. Since frequency of light solurce is double, the energy carried by each photon will be doubled. Hence intensity will be doubled even if number of photons remains constant.
When frequency of incident light is increased which among the following is correct?
Stopping potential increases with increase of incident light.
What happens to photoelectric current when frequency of incident radiation is increased?
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. … Frequency of photons is only related to the kinetic energy. Thus the current remains the same.
What is the effect on photoelectric current when the frequency of incident light increases?
We see in photoelectric effect by increasing frequency the K.E of photoelectrons increases. If velocity of electrons increases then time will be less then current should increase then why current remains constant.?