What is the wavelength of the helium-neon laser beam in the unknown liquid?

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    Laser Wavelength
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Homework Help Overview

The discussion revolves around determining the wavelength of a helium-neon laser beam when it travels through an unknown liquid, given its wavelength in air and the time taken to traverse a specific distance in the liquid.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the possibility of calculating the index of refraction using the speed of light in the liquid and the given travel time and distance. Questions arise about the sufficiency of the provided information for solving the problem.

Discussion Status

Some participants are exploring the relationship between the speed of light in the liquid and the index of refraction, while others suggest that the information provided may be sufficient to derive necessary values without additional data.

Contextual Notes

There is an emphasis on the need for clarity regarding the assumptions made about the properties of the unknown liquid and the implications of the travel time and distance provided.

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A helium-neon laser beam has a wavelength in air of 633nm. It takes 1.38 ns for the light to travel through 30cm of an unknown liquid.
What is the wavelength of the laser beam in the liquid?
 
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How do you think you might be able to solve this? What are your thoughts?
 
First i thought to solve for the index of refraction for the unknown liquid, by using n=c/v, but i think i need more info to solve it, that's were I am stuck
 
You shouldn't need any more information. Look at what you are given. You have a time to travel a certain distance. What can you find with this information?
 

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