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How fast do all electromagnetic waves travel?
The speed of light: 186,000 miles/sec = 3*10^8 meters/sec
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How does constructive interference differ from destructive interference?
The first one they reinforce eachother and the other cancels eachother out.
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List the seven separate wavelengths of visible light beginning with the longest:
Electric waves, radio wa ves, infraredwaves ultraviolet waves, x-ray-gamma ray.
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If you traveled at the speed of light, how long would it take you to travel to the nearest star outside our solar system?
4.3 light years to Centari
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Why do elements give off line spectra unique to each element?
When atoms are highly energized they can release light and more radiation.
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How could you determine the speed of sound through air?
If you stood 200m from a cannon and repeadidly measured the time between when you saw the cannon fire and when you heard the boom.
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Why does light bend as it passes through a block of glass?
Because when the light hits the glass it slows down causing it to bend.
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Why does sound travel faster in warm air than cold air?
Because the molecules are spread out causing more room to vibrate and travel faster.
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What are you actually seeing when you see colors?
Light reflected off the object
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How is it that, we call visible light "white light"?
When red, blue, green, are mixed they become white.
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Name the 3 types of waves:
- Transverse waves
- Longitudinal waves
- Water waves
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State the Law of Reflection:
The angle of incidence must be equal to the angle of reflection.
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State the Law of Refraction:
The angle of incidence and the angle of reflection must never equal each other.
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State the Law of Charges:
Light charges repel, unlike charges attract.
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Exactly, what are sound waves?
Sound waves are mechanical waves produced by a vibration that causes alternating compressions and rarefractions.
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Why can't sound travel through a vacuum?
Because theirs no molecules to vibrate the sounds cannot be made unless touching something.
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Why does sound travel faster in solids than gases?
More atoms therefore more vibrations.
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How does RADAR work?
A microwave is fired at an object bounces back to the radar and transmits info.
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Explain how a laser works.
Gases are coiled as a tube and a ruby rod and is energized and asborbed causing the rest of the photons trying to escape making the beam.
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Why does the sky look blue?
When sunlight passes through the atmosphere it scatters the light making it blue.
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How are rainbows formed?
Raindrops are used as tiny prism and the light hits the raindrops making the colors.
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Label the electromagnetic spectrum:
Power, Radio Waves, Microwaves, Infrared, Optical, UV Rays, X Rays, Gamma Rays
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