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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
Write two characteristic features observed is photoelectric effect which supports the photon pictures of electromagnetic radiation ?
The photocurrent in an experiment on photoelectric effect increases if ______.
What did experiments by Hallwachs and Lenard show about light and metals?
What were the roles of the two metal plates in Lenard's experiment?
How did the emitted electrons produce current in Lenard's circuit?
Under what condition did current flow in Lenard's experiment?
Which apparatus did Hallwachs use?
What charge was given to the zinc plate before its exposure to ultraviolet light in Hallwachs' experiment?
What was connected to the charged zinc plate in Hallwachs' procedure?
Which group of metals can emit electrons even under visible light?
