Does Widening the Slit Increase Brightness in Young's Slit Experiment?

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Homework Help Overview

The discussion revolves around Young's slit experiment, specifically questioning the relationship between slit width and wave intensity at the maxima. Participants explore whether widening the slit would increase brightness and how it affects diffraction and interference patterns.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the implications of widening the slit on intensity and diffraction, with some suggesting that increased slit width could lead to greater intensity due to reduced diffraction, while others question the relationship between diffraction and interference.

Discussion Status

The conversation is ongoing, with participants offering differing perspectives on how slit width affects intensity and diffraction. Some guidance has been provided regarding the definitions of intensity and irradiance, but no consensus has been reached.

Contextual Notes

There appears to be some confusion regarding the terms used, particularly between intensity and irradiance, as well as the implications of diffraction on interference patterns.

saltrock
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Young's slit experiment question!Help me

On a young's slit experiment,i found that,even at the maxima,the wave intensity was small.If i had made the slit wider to let more energy through,would the wave intensity be brighter at maxima?If not why?
 
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Yes, the irradiance (and the intensity) would be greater because the light is diffracting over a smaller angle.

Note that the units for intensity are W/Steradian, the units for irradiance are W/m^2. I suspect you are actually referring to irradiance.

Claude.
 
I think if i made the slit wider,

>that means the diffraction is less
>less diffraction=less interference
>which means the intensity (brightneess)decreases.

Correct me if i am wrong please!
 
You are sort of correct by say "diffraction is less," if you mean that the beam is less spread out. If the slit is widened, the path of the photons would become less uncertain, meaning the photon concentration that falls on the central maxima will be greater. This means greater intensity.
 
What do you mean by 'less interference'?

Claude.
 

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