Advertisements
Advertisements
Question
Write two characteristic features observed is photoelectric effect which supports the photon pictures of electromagnetic radiation ?
Advertisements
Solution
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.
RELATED QUESTIONS
Plot a graph showing the variation of photoelectric current with intensity of light. The work function for the following metals is given:
Na: 2.75 eV and Mo : 4.175 eV.
Which of these will not give photoelectron emission from a radiation of wavelength 3300
\[A^\circ\] from a laser beam? What happens if the source of laser beam is brought closer?
Lenard observed photoelectric effect using
Which one of the following metals does not exhibit emission of electrons from its surface when irradiated by visible light?
At the end of the nineteenth century, which interaction were scientists studying?
What were the roles of the two metal plates in Lenard's experiment?
Which plate was exposed to ultraviolet light in Lenard's procedure?
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?
Which metals generally require ultraviolet radiation for photoelectric emission?
Which group of metals can emit electrons even under visible light?
