# Science Test Study Guide

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1. How fast do all electromagnetic waves travel?
The speed of light: 186,000 miles/sec = 3*10^8 meters/sec
2. How does constructive interference differ from destructive interference?
The first one they reinforce eachother and the other cancels eachother out.
3. List the seven separate wavelengths of visible light beginning with the longest:
Electric waves, radio wa ves, infraredwaves ultraviolet waves, x-ray-gamma ray.
4. 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
5. Why do elements give off line spectra unique to each element?
When atoms are highly energized they can release light and more radiation.
6. 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.
7. 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.
8. 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.
9. What are you actually seeing when you see colors?
Light reflected off the object
10. How is it that, we call visible light "white light"?
When red, blue, green, are mixed they become white.
11. Name the 3 types of waves:
• Transverse waves
• Longitudinal waves
• Water waves
12. State the Law of Reflection:
The angle of incidence must be equal to the angle of reflection.
13. State the Law of Refraction:
The angle of incidence and the angle of reflection must never equal each other.
14. State the Law of Charges:
Light charges repel, unlike charges attract.
15. Exactly, what are sound waves?
Sound waves are mechanical waves produced by a vibration that causes alternating compressions and rarefractions.
16. Why can't sound travel through a vacuum?
Because theirs no molecules to vibrate the sounds cannot be made unless touching something.
17. Why does sound travel faster in solids than gases?
More atoms therefore more vibrations.