Intensity of red laser vs blue laser

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SUMMARY

The discussion centers on the intensity comparison between blue and red lasers, highlighting that intensity is determined by amplitude rather than wavelength. The red laser has a longer wavelength and lower frequency compared to the blue laser, but this does not directly influence intensity. The conclusion is that without specific amplitude values, one cannot definitively determine which laser has higher intensity. The relationship between intensity and amplitude is emphasized, drawing a parallel to sound volume.

PREREQUISITES
  • Understanding of laser physics, specifically wavelength and frequency.
  • Knowledge of the relationship between amplitude and intensity.
  • Familiarity with the wave equation (v = wavelength * frequency).
  • Basic concepts of sound intensity for comparative analysis.
NEXT STEPS
  • Research the relationship between amplitude and intensity in wave mechanics.
  • Explore the characteristics of blue lasers versus red lasers in practical applications.
  • Study the physics of light and its properties, including wavelength and frequency.
  • Learn about measuring laser intensity and the tools used in laser technology.
USEFUL FOR

Students in physics, laser technology enthusiasts, and professionals in optical engineering will benefit from this discussion, particularly those interested in the properties and applications of different laser types.

allergic
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1. Homework Statement :
Consider two lasers, one blue and one red. Which of the two lasers has the higher intensity?


2. these are my choices:
The blue one.
Cannot be decided based on the information given.
The red one.


3. The Attempt at a Solution :
The difference between these two lasers is their wavelength. Red has a higher wavelength than blue. Both have the same velocity, so red also has a lower frequency than blue (because v = wavelength * frequency). However, intensity depends on amplitude. (this is where I'm not sure) Amplitude does not depend on wavelength even though the displacement depends on both amplitude and wavelength, so we cannot decide with the given information.

am i right or totally off?
 
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You are completely right.
 
I also think the intensity is given by the amplitude.. Just like volume in sound is given by it.
 

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