1 Waves and Vibrations By : Musab Emad 9/8. 2 Waves are everywhere in nature Sound waves, visible light waves, radio waves, microwaves, water waves, sine.

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Presentation transcript:

1 Waves and Vibrations By : Musab Emad 9/8

2 Waves are everywhere in nature Sound waves, visible light waves, radio waves, microwaves, water waves, sine waves, telephone chord waves, stadium waves, earthquake waves, waves on a string, slinky waves

3 What is a wave? a wave is a disturbance or variation that travels through a medium from one location to another and that may take the form of an elastic deformation or of a variation of pressure, electric or magnetic intensity, electric potential, or temperature. a wave transfers energy.

4 Longitudinal Wave The wave we see here is a longitudinal wave. The medium particles vibrate parallel to the motion of the pulse. This is the same type of wave that we use to transfer sound. Can you figure out how?? show tuning fork demo

5 Transverse waves A second type of wave is a transverse wave. We said in a longitudinal wave the pulse travels in a direction parallel to the disturbance. In a transverse wave the pulse travels perpendicular to the disturbance.

6 Transverse Waves The differences between the two can be seen

7 Anatomy of a Wave The points A and F are called the CRESTS of the wave. This is the point where the wave exhibits the maximum amount of positive or upwards displacement crest

8 Anatomy of a Wave The points D and I are called the TROUGHS of the wave. These are the points where the wave exhibits its maximum negative or downward displacement. trough

9 Anatomy of a Wave The distance between the dashed line and point A is called the Amplitude of the wave.\ This is the maximum displacement that the wave moves away from its equilibrium. Amplitude

10 Anatomy of a Wave The distance between two consecutive similar points (in this case two crests) is called the wavelength. This is the length of the wave pulse. Between what other points is can a wavelength be measured? wavelength

11 Anatomy of a Wave What else can we determine? We know that things that repeat have a frequency. How could we find a frequency of a wave?

12 Wave frequency We know that frequency measure how often something happens over a certain amount of time. We can measure how many times a pulse passes a fixed point over a given amount of time, and this will give us the frequency.

13 Wave frequency Suppose wiggle a man back and forth, and count that 6 waves pass a point in 2 seconds. What would the frequency be? 3 cycles / second 3 Hz we use the term Hertz (Hz) to stand for cycles per second.

14 Wave Speed We can use what we know to determine how fast a wave is moving. What is the formula for velocity? velocity = f F= frequency = wave length

15 Wave Behavior Now we know all about waves. How to describe them, measure them and analyze them. But how do they interact?

16 Wave Behavior We know that waves travel through mediums. But what happens when that medium runs out?

17 Boundary Behavior The behavior of a wave when it reaches the end of its medium is called the wave’s BOUNDARY BEHAVIOR. When one medium ends and another begins, that is called a boundary.

18 Fixed End One type of boundary that a wave may encounter is that it may be attached to a fixed end. In this case, the end of the medium will not be able to move. What is going to happen if a wave pulse goes down this string and encounters the fixed end?

19 Fixed End Here the incident pulse is an upward pulse. The reflected pulse is upside-down. It is inverted. The reflected pulse has the same speed, wavelength, and amplitude as the incident pulse.

20 Fixed End Animation

21 Free End Another boundary type is when a wave’s medium is attached to a stationary object as a free end. In this situation, the end of the medium is allowed to slide up and down. What would happen in this case?

22 Free End Here the reflected pulse is not inverted. It is identical to the incident pulse, except it is moving in the opposite direction. The speed, wavelength, and amplitude are the same as the incident pulse.

23 Free End Animation

24 Wave Interaction All we have left to discover is how waves interact with each other. When two waves meet while traveling along the same medium it is called INTERFERENCE.