Question about light intensity and resistance

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SUMMARY

This discussion focuses on using a Light Dependent Resistor (LDR) to measure light intensity in a physics experiment involving diffraction gratings. The key to obtaining accurate light intensity measurements lies in consulting the technical data sheet for the specific LDR part number, which provides essential information on how resistance changes with light intensity and the sensitivity of the LDR across different wavelengths. Understanding these parameters is crucial for designing an effective experimental setup.

PREREQUISITES
  • Understanding of Light Dependent Resistors (LDR)
  • Familiarity with diffraction gratings
  • Knowledge of resistance and its relationship to light intensity
  • Ability to interpret technical data sheets
NEXT STEPS
  • Research the technical data sheets for various LDR part numbers
  • Learn about the principles of diffraction gratings and their application in experiments
  • Study the relationship between resistance and light intensity in LDRs
  • Explore methods for calibrating LDRs for accurate light intensity measurements
USEFUL FOR

Students conducting physics experiments, educators teaching optics, and anyone interested in practical applications of LDRs in measuring light intensity.

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Homework Statement


For my physics coursework, I have to design a laboratory experiment using an LDR to investigate how intensity of light emitted from a lamp varies with wavelength. In the procedure I will use diffraction gratings to separate light into wavelengths. The problem I am having is "How a measure of light intensity can be obtained from the LDR" please can anybody show me how to obtain intensity from an LDR.
thanks


Homework Equations





The Attempt at a Solution

 
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You need the technical data sheet for the particular LDR part number you will be using. The data sheet will tell you how the LDR resistance changes with light intensity, and how the sensitivty of the LDR varies with the wavelength of the light.
 

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