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Questions and Answers
Which of the following is a form of electromagnetic radiation?
Which of the following is a form of electromagnetic radiation?
- Heat
- Pressure
- Light (correct)
- Sound
What is the speed of light in a vacuum?
What is the speed of light in a vacuum?
- $3 \times 10^8$ meters per second (correct)
- $3 \times 10^{10}$ meters per second
- $3 \times 10^6$ meters per second
- $3 \times 10^4$ meters per second
Which color of light has the shortest wavelength?
Which color of light has the shortest wavelength?
- Yellow
- Blue (correct)
- Green
- Red
In which medium does light travel fastest?
In which medium does light travel fastest?
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What property of light determines its color?
What property of light determines its color?
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Which of the following is a characteristic of light?
Which of the following is a characteristic of light?
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What happens to the speed of light when it passes through a material medium?
What happens to the speed of light when it passes through a material medium?
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What does the term 'electromagnetic radiation' encompass?
What does the term 'electromagnetic radiation' encompass?
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Study Notes
Electromagnetic Radiation
- Electromagnetic radiation includes forms such as X-rays, gamma rays, ultraviolet (UV) radiation, visible light, infrared (IR) radiation, microwaves, and radio waves.
Properties of Light
- The speed of light in a vacuum is approximately 299,792,458 meters per second (m/s) or 186,282 miles per second (mi/s).
Light Characteristics
- Violet light has the shortest wavelength among visible light colors.
- The property of light that determines its color is its wavelength.
- Light is a transverse wave and an electromagnetic wave.
Behavior of Light in Media
- Light travels fastest in a vacuum, and its speed decreases when passing through a material medium, due to interactions with the medium's particles.
- Electromagnetic radiation encompasses the entire spectrum of radiation, from low-frequency, long-wavelength radiation (radio waves, microwaves) to high-frequency, short-wavelength radiation (gamma rays, X-rays).
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