Dual nature of radiation and matter ( photoelectric effect)
1. Define work function of a metal?
The minimum energy required for an electron to escape from the metal surface is called the work function of the metal
2. Define 1eV
1eV is the energy gained by an electron when it is accelerated through a potential difference of one volt.
3. Define thermionic emission?
Emission of electron from a metal surface when it is heated to sufficiently high temperature is called thermionic emission.
4. Define field emission?
Emission of electron from metal surface when it is subjected to high electric field (of the order of 10 8 v) is called field emission.
5. Define photoelectric emission?
Emission of electrons from metal surface, when it is illuminated with light of suitable frequency is called photoelectric effect.
6. Who discovered photoelectric effect?
Henrich Hertz discovered photoelectric effect.
7. Define threshold frequency of a metal?
Threshold frequency of a metal is the minimum cut-off frequency of incident light below which no photoelectric emission takes place irrespective of intensity of incident light.
8. How photo electric current depends on intensity of incident light?
Above threshold frequency, photoelectric current is directly proportional to intensity of incident light.
9. What do you mean by saturation current?
As the potential of collector is increased for a radiation of certain high frequency and intensity, photoelectric current increases and reaches to a maximum constant value. This constant current is called saturation current.
10. Define stopping potential of a given photosensitive metal?
Stopping potential of a photosensitive metal is defined as the minimum negative potential applied to the collector at which the photoelectric current just drops zero.
11. Define quanta?
Radiation energy is made up of discrete unit of energy called quanta.
12. What is a de-Broglie wave?
A wave associated with moving particle is called de-Broglie wave.
13. What is the experimental outcome of Davisson and Germer experiment?
Davisson and Germer provided experimental proof for the wave nature of matter particle and verified the de-Broglie’s expression for wavelength of matter wave.
14. What happens to the kinetic energy of photoelectrons if the intensity of incident radiation is increased?
Kinetic energy remains same as kinetic energy is independent of intensity of incident radiation
15. Why sufficiently powerful AM radio signal cannot produce photoelectric effect?
The energy of radio photon is less than the work function of any metal so even sufficiently powerful AM radio signal cannot produce photoelectric effect.
The minimum energy required for an electron to escape from the metal surface is called the work function of the metal
2. Define 1eV
1eV is the energy gained by an electron when it is accelerated through a potential difference of one volt.
3. Define thermionic emission?
Emission of electron from a metal surface when it is heated to sufficiently high temperature is called thermionic emission.
4. Define field emission?
Emission of electron from metal surface when it is subjected to high electric field (of the order of 10 8 v) is called field emission.
5. Define photoelectric emission?
Emission of electrons from metal surface, when it is illuminated with light of suitable frequency is called photoelectric effect.
6. Who discovered photoelectric effect?
Henrich Hertz discovered photoelectric effect.
7. Define threshold frequency of a metal?
Threshold frequency of a metal is the minimum cut-off frequency of incident light below which no photoelectric emission takes place irrespective of intensity of incident light.
8. How photo electric current depends on intensity of incident light?
Above threshold frequency, photoelectric current is directly proportional to intensity of incident light.
9. What do you mean by saturation current?
As the potential of collector is increased for a radiation of certain high frequency and intensity, photoelectric current increases and reaches to a maximum constant value. This constant current is called saturation current.
10. Define stopping potential of a given photosensitive metal?
Stopping potential of a photosensitive metal is defined as the minimum negative potential applied to the collector at which the photoelectric current just drops zero.
11. Define quanta?
Radiation energy is made up of discrete unit of energy called quanta.
12. What is a de-Broglie wave?
A wave associated with moving particle is called de-Broglie wave.
13. What is the experimental outcome of Davisson and Germer experiment?
Davisson and Germer provided experimental proof for the wave nature of matter particle and verified the de-Broglie’s expression for wavelength of matter wave.
14. What happens to the kinetic energy of photoelectrons if the intensity of incident radiation is increased?
Kinetic energy remains same as kinetic energy is independent of intensity of incident radiation
15. Why sufficiently powerful AM radio signal cannot produce photoelectric effect?
The energy of radio photon is less than the work function of any metal so even sufficiently powerful AM radio signal cannot produce photoelectric effect.
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