5.5 DIFFRACTION OF WAVES

CHAPTER 5
WAVES

5.4 DIFFRACTION OF WAVES

TEXT BOOK : PAGE 202 - 209

CHAPTER 5 WAVES
5.4 REFRACTION OF WAVES

CHAPTER 5 WAVES
5.3 REFLECTION OF WAVES

There are 4 phenomena of waves Reflection

4 fenomena gelombang Pantulan

Interference Waves Refraction

Interferens Pembiasan

Diffraction
Pembelauan

5.5 Diffraction of Waves CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES
(Pembelauan Gelombang)

Embankment (benteng) built in Marang,
Terengganu.
Sea waves spread out while propagating
through the gap in the embankment.

Plane wavefront in region A changes to
circular wavefront in region B

This phenomenon called diffraction of
waves.

Diffraction of waves is the spreading of waves when the CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES
waves propagate through a slit or side of a barrier.
The waves spread
Plane waves go
through the slit around the barrier

Plane waves
becomes curve

Then the waves From one direction There is/are slit or
to many direction. barrier, the waves still in
spreading out and curve.
the same medium.

Although waves direction changed because of CHAPTE
slit/barrier, waves still inside same medium. 5.4 DIFFRACTION

The waves spread (sebar) The waves spread (sebar)

around the barrier. around the barrier.
(building/wall/mountain)

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

To study the factors which
influence diffraction of water
waves.

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

Patterns of Diffracted Water Waves

Study the effects of the size of slit and wavelength
on the diffraction of water waves.

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

Diffraction of waves is influenced by the size of slit and wavelength.

Effects of Diffraction of waves

Fixed Wavelength Fixed size of slit

Wide slit Narrow slit Short Long
wavelength wavelength
Less
spreading More Less More
spreading spreading spreading

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

Diffraction of Waves in Daily Life

Diffractions of Waves

Water Waves Light Waves Sound Waves

Produces calm of water regions Holograms as safety Infrasonic waves produced by
suitable for docking of ships and features on bank cards.
water recreational activities. elephants have long

wavelength to facilitate long

distance communication

between elephants.

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

Shorter Longer wavelength,
wavelength, less more spreading

spreading All in same medium,
make sure wavelength
Bigger gap, less
spreading is same before and
after diffraction

Smaller gap, more
spreading

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

(a) Sound waves propagate from television to all space, when waves
reach the door or window, sound waves will go through the open
door and window, then waves will spreading, waves direction
changed, sound waves reach the child.
(b) Reflection

CHAPTER 5 WAVES
5.4 DIFFRACTION OF WAVES

THE END