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Summary powerful ppt nd notes on photoelectric effect $8.19   Add to cart
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Summary powerful ppt nd notes on photoelectric effect
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  • Course
  • Science
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  • Sixth Year / 12th Grade

This document gives an in-depth and clear knowledge on the topic photoelectric effect. created just for the students to understand the concept and improve themselves. this includes examples, photos, numericals for better undestanding

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Document information

  • July 19, 2024
  • 24
  • 2023/2024
  • Summary

Subjects

  • physics
  • phy
  • photo
  • photoelectric
  • effect
  • sci
  • science
  • 12th
  • modern phy

Written for

  • Secondary school
  • Science
  • 5
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Photoelectric effect
 1887 –Hertz – UV rays are made to fall on negative plate of discharge tube –
electric discharge was easier.
 Hallwachs – experimentally confirmed- two zinc plates inside a vacuum bulb-
UV rays falls on negative plate –current flows .
 As UV rays stopped current also stops.
 UV rays falls on positive plate- no current flows.
 JJ Thomson- When light falls metal surface electrons are emitted from the
negative plate and attracted towards the positive plate –current flows.
 If the rays falls on positive plate the electrons emitted from this plate do not
reach negative plate because electrons are negatively charged –circuit not
completed – no current flows.

,Hertz and Lenard’s observations
• Different plates –illuminated them with light of different frequencie
and different intensities and
• measured energy of
• photoelectrons and strength of
• photocurrent.

, Dependence on intensity of light
• Light of definite intensity and definite frequency falls on the plate –
photoelectrons are emitted from plate 1 and reaches plate 2 if plate
at sufficient positive potential.
• If positive potential of plate 2 is increased no increase in photocurren
because all electrons emitted are already reaching Plate 2.
• Intensity of incident light is increases,
photocurrent also increases- only when
accelerating potential and frequency of inciden
light is kept constant.

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