
SKJ_ProbMat
Flashcard
•
Science
•
11th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a phosphor?
Back
A phosphor is a substance that emits light when excited by radiation, typically converting high-energy photons to low-energy photons.
2.
FLASHCARD QUESTION
Front
What is the refractive index of a material?
Back
The refractive index is a dimensionless number that describes how light propagates through that medium, determined mainly by the material's dipoles.
3.
FLASHCARD QUESTION
Front
What happens to photons with energy below the band gap in a semiconductor photodetector?
Back
They are mostly transmitted without absorption.
4.
FLASHCARD QUESTION
Front
What is the formula for phase velocity when a wave travels from vacuum into a non-magnetic medium?
Back
The phase velocity is given by c/n, where c is the speed of light in vacuum and n is the refractive index.
5.
FLASHCARD QUESTION
Front
Which material has the highest refractive index and why?
Back
Diamond has the highest refractive index due to its lattice having a very high atomic concentration.
6.
FLASHCARD QUESTION
Front
What is the role of dipoles in determining the refractive index of a transparent medium?
Back
Dipoles in the material interact with the electric field of light, affecting how light is refracted.
7.
FLASHCARD QUESTION
Front
What is the relationship between phase velocity and group velocity in a medium?
Back
In general, phase velocity is not equal to group velocity; they can differ depending on the medium.
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