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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.
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उत्तर
(i) Plank constant is given by slope of the curve i.e.
`h =(ΔKE)/(Deltav)`
(ii) Work function is the minimum energy required by the electron to escape out of the metal surface thus,
Φ = hν° Here, ν° is the threshold frequency
संबंधित प्रश्न
The photocurrent in an experiment on photoelectric effect increases if ______.
Define the following with reference to photoelectric effect :
(a) Threshold frequency (`f_0`)
(b) Stopping potential (`V_s`)
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?
What are photoelectrons?
What did experiments by Hallwachs and Lenard show about light and metals?
How did the emitted electrons produce current in Lenard's circuit?
What radiation was allowed to fall on the zinc plate in Hallwachs' experiment?
What happened to the electroscope when ultraviolet light fell on the zinc plate?
Which group of metals can emit electrons even under visible light?
