Terms and Concepts: Waves
1. Doppler Effect: What is it?
A change in frequency caused by the movement of the source
Happens with all wave
`` 2. What is diffraction?
The bending or spreading of a wave around an obstacle
3. Def of a wave-
A disturbance in space that carries energy and is caused by a vibration
4. What is a red shift?
A change in the color of light as an object moves away from you at the speed of light
5. What is a blue shift?
A change in the color of light as an object moves towards you at the speed of light
6. Can humans hear ultrasonic waves?
No
7. Look over your slinky lab: especially the interference parts + reflection
Look at PWR Point
8. Does a light wave require a medium to travel through?
NO ELECTROMAGNETICS DON’T NEED ANYTHING
9. What is a mechanical wave?
Requires a medium
10. What is constructive interference?
When two waves meet in phase ( crest to crest / Trough to trough ) and get bigger
11. What is destructive interference?
When two waves meet in phase ( crest to crest / Trough to trough ) and get smaller or cancel
12. What is refraction?
The bending of a wave because of the change in speed as it changes from one place to another
13. What is reflection?
When light bounces off an area
14. What does the amplitude of a wave tell us about the wave?
How powerful it is ( The bigger the amplitude the more energy it carries )
15. What is a transverse wave?
The particles move at right angles to the direction of the energy flow. The energy moves in one direction
16. What is a compressional (longitudinal wave)
Energy moves in one direction but the particles move back and forth parallel to the direction of the energy
17. An example of a transverse wave?
Anything that is an electromagnetic wave. It has a crest or trough ( light ) Ex: Microwave
18. An example of a compressional wave?
Sound waves
19. What is the simplest type of a wave?
A Pulse ( A one-time thing )
20. Do we ever see anything as it is in real-time? Why or Why not?
No, because light has to hit something bounce off, and hit back. You never see anything as it is only as it was
21. Speed of light?
300,000 meters per second
22. Speed of sound
330 meters per second / 700 miles per hour
23. What does the speed of sound depend upon?
What it's traveling through ( solid liquid or gas ) and the temperature
Amplitude: a measure of the size of the distance of a wave
Wavelength: distance between one point on a wave and the nearest point just like it
Crest: Highest point of a wave
Trough: The lowest point of a wave
Frequency: the number of wavelengths that pass a fixed point each second, is expressed in hertz(Hz)
Area of Compression: region in a longitudinal wave where the particles are closest together
Area of rarefaction: the less-dense region on a longitudinal wave
25. Why did the test tube disappear in the properties of the wave lab?
The refraction for the test tube and the oil is the same so it becomes transparent because it bends light around it
26. What happens to the speed of sound if the medium temperature rises?
If the temperature increases the speed of sound also increases and vice versa
27. Did the spectra of the metallic salts we burned in the lab all look the same?
No, because the colors are different depending on the materials used
28. Did the spectra of the different colored lights in the lab all look the same?
No, they had similar colors
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