Advertisements
Advertisements
प्रश्न
Write two characteristic features observed is photoelectric effect which supports the photon pictures of electromagnetic radiation ?
Advertisements
उत्तर
The two characteristics features observed in photoelectric effect which support the photon pictures of electromagnetic radiation one:
(a) All photons of light of a particular frequency ν, or wavelength λ, have the same energy `E (=hv = (hc)/lambda)` and momentum `P(=h/lambda)`whatever the intensity of radiation may be. The increase in intensity of the radiation implies an increase in the number of photons crossing a given area per second,
(b) Photons are electrically neutral and are not deflected by electric and magnetic fields.
संबंधित प्रश्न
Draw a graph between the frequency of incident radiation (υ) and the maximum kinetic energy of the electrons emitted from the surface of a photosensitive material state clearly how this graph can be used to determine (i) Planck’s constant and (ii) work function of the material.
Define the following with reference to photoelectric effect :
(a) Threshold frequency (`f_0`)
(b) Stopping potential (`V_s`)
Photoelectric effect is ______.
What are photoelectrons?
What did Lenard use to contain the emitter and collector plates?
What were the roles of the two metal plates in Lenard's experiment?
Which apparatus did Hallwachs use?
What happened to the electroscope when ultraviolet light fell on the zinc plate?
What were the particles emitted from the zinc surface in Hallwachs' experiment?
What occurs when incident radiation is below the threshold frequency for a metal?
