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Mr Ng Han Guan Form 5 Chapter 1: Wave Guru Cemerlang Physics MSAB Date: 3 rd edition © 2011 | chp 2 | Maktab Sultan Abu Bakar | Sekolah Kluster Kecemerlangan 10 1.4.2 Diffraction of light waves 1. Diffraction of light waves is barely noticeable because light has very short wavelength . 2. Light waves will be diffracted if: (i) Light is propagated through a small slit or small pinhole (size is similar to that of the light wavelength). (ii) The light source is monochromatic light of one colour and therefore of one wavelength only. 3. The wider middle bright fringe shows that the light waves diffracted after pass through a narrow slit. 4. If the slit becomes wider , diffraction pattern becomes less distinct . 1.4.3 Diffraction of sound waves 1. A listener is able to hear the sound of the radio although it is behind the wall (beyond his vision). 2. It is because the sound of the radio spreads around the corner of the wall due to diffraction of sound. Sound waves are more easily diffracted in comparison to light waves because the wavelength of sound waves is much longer than the wavelength of light waves . 1.5 ANALYSING INTERFERENCE WAVE 1. Interference is the superposition of two waves from two coherent sources meet. 2. Two waves are in coherent if they are of the same frequency , amplitude and are in phase . 3. There are two types of interference: i. Constructive interference Produce maximum resultant amplitude . ii. Destructive interference Produce zero resultant amplitude .
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