# Phycis Form 5: Chapter 1.4 Diffraction of Waves

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Information about Phycis Form 5: Chapter 1.4 Diffraction of Waves
Education

Published on March 9, 2014

Author: C_Qhaiyum

Source: slideshare.net

## Description

Our presentation ! :D Physics Form 5: Chapter 1.4 Diffraction of Waves ..

PHYSICS 1.4 Diffraction of Waves Prepared by: Qhaiyum Budi Nadzri Aimran Abdullah Azam

Definition of Diffraction Diffraction is the spreading of waves that happens when it passes through a narrow opening or when it passes round a small obstacle along it’s path.

Characteristics of Diffraction When diffraction occurs: i. ii. iii. iv. v. Wave direction changes. Wave velocity, ν, changes. Wavelength, λ, is unchanged. Frequency, ƒ, is unchanged. Speed unchanged. The amplitude, а, of the diffracted wave is smaller compared to that of the incident wave, as the wave energy is spread out over a larger surface.

Diffraction of Water Waves Waves are diffracted more if the i. Opening is narrow. ii. Obstacle is small.

When the width of the opening is smaller than the wavelength, λ, the wave will be well diffracted. When the opening is very narrow, the wave is very well diffracted. The size of the opening is too big, the wave is not well diffracted.

When the size of the obstacle is smaller than the wavelength, λ, the wave will be well diffracted. The size of the obstacle is small, the waves are well diffracted. The size of the obstacle is too big, the waves are not well diffracted.

Diffraction of Light Waves Light is diffracted when it passes through a very narrow opening such as a pin-hole or a slit. The diffraction pattern produced by light consists of a central bright fringe and a few smaller bright fringes, separated by dark fringes.

Diffraction of Sound Waves Sound can be diffracted as it passes through window slits or wall corners. The cleaner standing at the point where he cannot see the radio but he can hear the sound from it due to diffraction of sound waves by the wall corner.

Applications in Everyday Life Sea-walls in a harbour jetty: i. Strong concrete walls are usually built in the sea near a harbour jetty to protect the boats from damage caused by strong waves. ii. When strong waves rush towards the harbour jetty, the concrete barriers reflect some of the waves and allow others to diffract through the opening between the barriers.

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