By Aries Triwidajati S. Spd

WAVE By Aries Triwidajati S. SPd

INDICATORS 

 

Compare the characteristics of mechanical and electromagnetic waves. Compare the characteristics of transversal and longitudinal waves Investigate the wavelength on the slinky for transversal and longitudinal wave

LEARNING OBJECTIVES Student can be able to : 2. Determine the characteristics of mechanical and electromagnetic waves. 3. Determine the characteristics of transversal and longitudinal waves

Wave ?????? A wave can be described as a disturbance that travels through a medium from one location to another location or The repeating and periodic disturbance which moves through a medium from one location to another is referred

Medium??????? Medium is a substance or material which carries the wave. 1. 2. 3.

Solid Liquid Gas

Types of waves according to the medium  Mechanical

waves is a wave which require a material medium for their propagation Examples: water waves, sound waves, seismic waves, and shock waves.  Electromagnetic waves is a wave that can pass through vacuum in addition to passing through matter. Examples:- light waves, radio waves, micro waves, x-rays.

Type of waves according to the direction of propagation 1. 2.

Transversal Wave Longitudinal Wave

TRANSVERSAL WAVE

DIRECTION OF VIBRATION CREST B PROPAGATION DIRECTION

D’ A

B’

C

AMPLITUDE D TROUGH PICTURE 3

E

Picture 2

Compression

Direction of vibration

Direction of wave movement

Picture 4

Expansion

Summarizing and applying 2. Draw the form of transversal wave and longitudinal wave and the parts its! a. Transversal wave b. Longitudinal wave 3. Compare the slow movement and fast movement, what does the Frequency comparison show as? 4. How does a wave can be traveled? A wave can be traveled because of the propagation of energy without the propagation of matter

4. How about the direction of wave vibration and direction wave movement in : a. Transversal wave In transversal wave direction of vibration perpendicular to the propagation direction b. Longitudinal wave In Longitudinal wave direction of vibration parallel to the propagation direction

5. What is called the 1 wavelength in transversal waves and longitudinal wave? One wavelength in the transversal wave can be defined the distance between two close crests or two close troughs One wavelength in the longitudinal wave can be defined the distance between two close compression or two close expansion

6. Draw a conclusion :

CONCLUSION A traveling wave can be defined as the propagation of energy without the propagation of medium. In transversal wave direction of vibration perpendicular to the propagation direction In Longitudinal wave direction of vibration parallel to the propagation direction One wavelength in the transversal wave can be defined the distance between two close crests or two close troughs One wavelength in the longitudinal wave can be defined the distance between two close compression or two close expansion

1.

2.

3.

4.

The particles of the medium vibrate at right angles to the direction of wave motion. The wave is propagated in the form of crests troughs The wave motion possible in solids and on liquids surface It can undergo polarization

1.

2.

3.

4.

The particles of the medium vibrate parallel to the direction of wave motion The wave is propagated in the form of compressions and rarefaction The wave motion is possible any medium (Solid, liquid or gas) It can’t undergo polarization

Mathematic wave Wave Frequency is the number of waves passing definite points in one second. Frequency is symbolized by f and it’s IS Unit in hertz (Hz). Period is the time needed to make one wave. Period is symbolized by T and it’s IS Unit in second (s). Spread velocity of wave = frequency x wavelength The Formulation above as: T=1/f V = f x λ --- It’s IS unit in m/s or V = λ/T

Example : An Earthquake can produce three kinds of waves. One of them is a transversal wave of the type called Swave. The S-wave moves with a spread velocity of 5.000 m/s. Its wavelength is 417 m. What is the frequency ? Known : v = 5.000 m/s λ = 417 m. Asked : frequency (f) 2.

Formula : v = f x λ or f = v / λ

Solution = f = 5.000/ 417 = 12 Hz

Problem : Look at the picture below : Y (m)

1,5 m

6

0

2

4

8

t (s)

-6 Calculate : •

Amplitude

c. 1 wavelength

•

Period

d. Spread velocity

•

Frequency

Wave Frequency is the number of waves passing definite points in one second. Frequency is symbolized by f and it’s IS Unit in hertz (Hz). Period is the time needed to make one wave. Period is symbolized by T and it’s IS Unit in second (s). Spread velocity of wave = frequency x wavelength And it’s IS unit in m/s