What is the relationship between intensity and amplitude?

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Discussion Overview

The discussion revolves around the relationship between intensity and amplitude in the context of wave physics, particularly focusing on electromagnetic waves and wave optics. Participants explore definitions, mathematical relationships, and specific examples from educational materials.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Homework-related

Main Points Raised

  • One participant proposes that intensity is defined as power per unit area and questions how intensity relates to the square of amplitude.
  • Another participant raises a question about the relationship between intensity, energy density, and the speed of the wave.
  • A participant mentions that in electromagnetic radiation, half of the intensity is attributed to the electric field and the other half to the magnetic field.
  • There is a reference to NCERT example 8.5, suggesting it may illustrate relevant concepts.
  • Another participant asks about the condition for fringe formation in wave optics, specifically relating the size of the light source to the distance from the slits and wavelength.
  • Several participants inquire about the size of the light source, referencing NCERT example 10.4 (d) for clarification.

Areas of Agreement / Disagreement

Participants express curiosity and seek clarification on various aspects of the topic, but no consensus is reached on the relationships discussed or the implications of the examples cited.

Contextual Notes

Participants reference specific educational examples, indicating a reliance on those materials for understanding the concepts, but the discussion does not resolve the underlying assumptions or mathematical relationships involved.

Raghav Gupta
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I think basic definition of intensity is power by area.
How intensity is square of the amplitude?
How intensity is energy density times speed of thing?
How in a radiation of EM wave,
Half of the intensity is provided by elec.field and other by magnetic field?
 
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NCERT example 8.5 right?
 
AdityaDev said:
NCERT example 8.5 right?
Yeah, I got all the answers of that by some searching.
Can you answer this one,
In wave optics
taking size of light source =s and distance from 2 slits S,
How s/S <= λ/d
for the fringe formation to take place?
 
Last edited:
Size of light source??
 
AdityaDev said:
Size of light source??
As in NCERT example 10.4 (d) .
 

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