1. Properties of A Wave
Properties of A Wave

2. Wave – transfer of energy from one point to another without the transfer of matter between the two points. .

3. Electromagnetic Waves

4. Electromagnetic waves
Electromagnetic waves-can travel through the vacuum of space.

5. Mechanical Waves
Mechanical waves - disturbance in matter that carry energy from one place to another.
-Requires a medium through which to travel
The Medium can be solid, liquid or gas.

6. Drop Pebble in water- creates concentric circles that waves moves away from the pulse.

7. Surface Waves

8. Surface waves
The seagull floating in the water (or water molecule) moves in a roughly circular path as the wave travels past.

9. Surface Waves in Earthquakes

10. Mechanical waves ( 2 types)
Categorize the way by the way the particles move.
What kind of wave is this ?
Longitudinal or Transverse?

11. -Wave travels horizontally
oscillates vertically, particles move at right angles to the motion of the wave

12. Mechanical Waves
Longitudinal -the medium vibrate parallel to the direction of the wave

15. Waves Properties and Behavior

16. Waves repeat over a distance equal to the wavelength.
wavelength  Lambda (λ)
(λ)  is the distance between two consecutive crests or troughs

17. Crest of the wave- highest points
Troughs of the wave – lowest point
Distance from on crest to the next crest or trough to the next trough is a repeated length that equals the ( Wavelength)

18. λ = wavelength SI Unit = meter (m)
Disturbance over which wave repeats.
SI Unit = meter (m)

19. Connecting Ideas Learned about Period, Amplitude.
Wavelength is the distance crest to crest.
Period is how long it took to complete the cycle ( form crest to crest).

20. Characteristics of the wave
T ( period) of a wave is the time required for one ( wavelength to pass a given potion.
Frequency f = 1/ T
Frequency is the inverse of T
Amplitude (A) is the greatest displacement from the equilibrium
A from equilibrium to crest same as A from equilibrium to the trough

22. In a longitudinal wave
The crest = high pressure= compression
The trough = low pressure = rarefaction

23. How do you find the velocity of a wave?
If λ is the distance
And T is the time
What is the Velocity of the wave?

25. V = d/t
Speed = wavelength/ Period
V = λ / T
V = λ f
What is the SI units for the velocity of a wave?

26. SI units for velocity is always m/s

27. What determines the speed of the wave?
V (speed) = determined by the properties of the material medium, through which it travels

28. Generally – waves travel faster in mediums that are hard or stiff
Travel slower in mediums that are soft or squishy.
Example
Sound in air 343 m/s
Sound in water 1,400 m/s ( not as compressible)
Sound in solid – Steel- 5,960 m/s

29. Sound travels faster in warmer air
WHY?

30. Ocean waves – speed greater in deep water then shallow water (produce surf

31. Speed of light in vacuum, commonly denoted c, is a universal physical constant (  meters per second)
C = 3.00 x 108 m/s

34. Am and FM modulation