Podcast
Questions and Answers
What type of electromagnetic wave is primarily used for TV communication?
What type of electromagnetic wave is primarily used for TV communication?
- Radio Waves (correct)
- Infrared
- Microwaves
- Gamma Rays
Which property of light describes the distance between two peaks of a wave?
Which property of light describes the distance between two peaks of a wave?
- Frequency
- Wavelength (correct)
- Amplitude
- Velocity
Which color of visible light has the shortest wavelength?
Which color of visible light has the shortest wavelength?
- Violet (correct)
- Red
- Green
- Yellow
What does a higher frequency in light waves indicate?
What does a higher frequency in light waves indicate?
Which method explains how light reflects off surfaces?
Which method explains how light reflects off surfaces?
How does infrared light primarily feel to us?
How does infrared light primarily feel to us?
Which of the following electromagnetic waves has the highest energy?
Which of the following electromagnetic waves has the highest energy?
What happens when visible light passes through a prism?
What happens when visible light passes through a prism?
Flashcards
Electromagnetic Spectrum
Electromagnetic Spectrum
The range of all types of electromagnetic waves, which carry energy through space.
Wavelength
Wavelength
The distance between two peaks of a wave in the electromagnetic spectrum.
Frequency
Frequency
The number of waves that pass a point in one second. Higher frequency means more energy.
Wave model of light
Wave model of light
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Particle model of light
Particle model of light
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Ray model of light
Ray model of light
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Visible Light
Visible Light
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Refraction
Refraction
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Study Notes
The Electromagnetic Spectrum
- The electromagnetic spectrum is a range of electromagnetic waves carrying energy through space.
- Waves vary in wavelength (distance between peaks) and frequency (waves per second).
- Longer wavelengths have lower energy, shorter wavelengths have higher energy.
- Types of waves (longest to shortest wavelength):
- Radio waves (communication, TV, radio, cell phones)
- Microwaves (microwave ovens, radar)
- Infrared (IR) (heat, remote controls, night vision)
- Visible light (what we see, rainbow colors)
- Ultraviolet (UV) (sunburns, tanning beds)
- X-rays (seeing inside bodies, bones)
- Gamma rays (highest energy, cancer treatment)
Models of Light
- Scientists use three models to understand light:
- Wave Model: Light acts like a wave with crests and troughs. Explains interference and diffraction.
- Particle Model: Light is made of tiny particles called photons. Explains light energy and interactions with matter (e.g., solar panels).
- Ray Model: Light travels in straight lines (rays). Useful for reflection (mirrors) and refraction (lenses).
Properties of Waves (Including Light)
- Wavelength: Distance between wave peaks; shorter wavelength = higher energy.
- Frequency: Number of waves passing a point per second; higher frequency = more energy.
- Amplitude: Wave height; larger amplitude = brighter light (visible light).
- Speed: Light travels at approximately 300,000 km/s in a vacuum.
Properties of Visible Light
- Visible light is a small part of the electromagnetic spectrum we can see.
- It contains different colors, each with a different wavelength.
- Red (longest wavelength, least energy)
- Violet (shortest wavelength, most energy)
- Passing light through a prism separates it into a rainbow (refraction).
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