Advertisements
Advertisements
प्रश्न
List out the laws of photoelectric effect.
Advertisements
उत्तर
Laws of photoelectric effect:
- For a given frequency of incident light, the number of photoelectrons emitted is directly proportional to the intensity of the incident light. The saturation current is also directly proportional to the intensity of incident light.
- Maximum kinetic energy of the photoelectrons is independent of the intensity of the incident light.
- Maximum kinetic energy of the photoelectrons from a given metal is directly proportional to the frequency of incident light.
- For a given surface, the emission of photoelectrons takes place only if the frequency of incident light is greater than a certain minimum frequency called the threshold frequency.
- There is no time lag between the incidence of light and the ejection of photoelectrons.
APPEARS IN
संबंधित प्रश्न
Photons of wavelength λ are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic field having magnitude B. The work function of the metal is
What is the photoelectric effect?
How will you define threshold frequency?
Mention the different types of photocells.
Briefly discuss the observations of Hertz, Hallwachs and Lenard.
Obtain Einstein’s photoelectric equation with the necessary explanation.
Explain experimentally observed facts of the photoelectric effect with the help of Einstein’s explanation.
List out the characteristics of photons.
How many photons per second emanate from a 50 mW laser of 640 nm?
When a 6000 Å light falls on the cathode of a photo cell, photoemission takes place. If a potential of 0.8 V is required to stop emission of electron, then determine the
- frequency of the light
- energy of the incident photon
- work function of the cathode material
- threshold frequency and
- net energy of the electron after it leaves the surface.
