Refraction of wave

5.4 Refraction of Waves

Objective

01

02

Meaning of refraction

Index

03

Characteristic of wave

Sound wave

04

Phenomenom of refraction of sea water

05

06

Problem solving

Deep region to shalow region

i = 0

1. Angle of incidence, i = 0o, Angle of refraction, r = 0o, >>direction of propagation remain unchanged. 2. Wavelength increases 3. Frequency unchanged 4. Velocity increase

By the end of this lesson you should be able to… • Describe refraction of waves in terms of the angle of incidence, angle of refraction, wavelength, frequency, speed and direction of propagation • Draw a diagram to show refraction of waves.

Refraction

Occurs when there is a change of direction of the propagation of waves when it travel from a medium* to another medium due to a change in speed *Light & Sound: density Water wave: depth

Depth to shallow region

i not = 0

1. Angle of incidence, i = 0o, direction : move toward the normal 2. Wavelength decreases 4. Frequency unchanged 3. Velocity decreases

Shallow to depth region

i not = 0

1. Angle of incidence, i = 0o, direction : move away from the normal 2. Wavelength increases 3. Frequency unchanged 4. Velocity increases

Deep region to shalow region

1. Layer of air above the ground is warmer. 2. Sound moves faster in warm air 3. Sound refracted upward. 4. Sound not clear to observer.

1. Layer of air above the ground is warmer.2. Sound moves faster in warm air 3. Sound refracted upward. 4. Sound not clear to observer.

• cape is shallow region while bay is deep region • at cape, wave is slower so the wavelength is shorter • at bay, wave is faster so wavelength is longer • the difference in wavelength cause the wavefront to curve and follow shape of shore line • energy converge towards cape, diverge from bay amplitude at cape is bigger than bay

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