QQuestionPhysics
QuestionPhysics
"In a perfect vacuum, light waves travel at 300,000 kilometers per second. When light waves travel through materials, such as air, they:
A. speed up
B. slow down
C. increase in amplitude
D. heat up"
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Answer
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Step 1:Let's solve this problem step by step:
Step 2:: Understand the Fundamental Concept of Light Propagation
In a vacuum, light travels at its maximum speed of $$3 \times 10^{8} \mathrm{~m/s}$$.
Light travels at different speeds depending on the medium it passes through. When light enters a different medium, its speed changes due to the medium's optical properties.
Step 3:: Analyze the Behavior of Light in Different Media
When light passes from a vacuum into a material like air, it experiences a phenomenon called refraction. This means the light waves slow down due to interactions with the atoms and molecules in the medium.
Step 4:: Explain the Physical Mechanism
As light waves enter a material: - The electromagnetic waves interact with the electrons in the material - These interactions cause the light to slow down - The speed of light is reduced proportionally to the material's refractive index
Step 5:: Eliminate Incorrect Options
A. Speed up - Incorrect. Light does not increase speed in a material C. Increase in amplitude - Incorrect. Amplitude is not affected by the medium D. Heat up - Incorrect. Light doesn't inherently generate heat by passing through a medium
Step 6:: Identify the Correct Answer
B. Slow down - Correct. Light waves always slow down when traveling through a material compared to their speed in a vacuum.
Final Answer
Slow down
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