Interference of WAves (9.1)

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Interference of Waves Section 9.1.

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Presentation transcript:

Interference of WAves (9.1) The process of generating a new wave when two or more waves meet is called interference.

Terminology Two waves are said to be “In Phase” when their crests and troughs meet at the same place and same time thus creating constructive interference. Two waves are said to be “Out of Phase” when the crest of one wave meets the trough of the second wave at the same time thus creating destructive interference.

Terminology

Principle of Superposition The Principle of Superposition states that at any point the amplitude of two interfering waves is the simply the sum of the amplitudes of each individual wave

Types of Interference Constructive Destructive The process of forming a wave with a larger amplitude when two or more waves combine The process of forming a wave with a smaller amplitude when two or more waves combine

Types of Interference

Interference of Waves Simulator http://zonalandeducation.com/mstm/physics/waves/interference/waveInterference1/WaveInterference1.html

Technology Using Interference of Waves Noise Cancelling Headphones Use concept of destructive interference to cancel out unwanted noise so we can listen to music at a lower volume Image taken from pg. 418 of Nelson Physics 11

References https://www.youtube.com/watch?v=x2Iwrhynq9o Nelson Physics 11 http://zonalandeducation.com/mstm/physics/waves/interference/waveInterference1/WaveInterference1.html http://www.acs.psu.edu/drussell/Demos/superposition/superposition.html https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcT8LvQHLKLAYRs4glr0XC2dmnA5NvJkMF48K8EhhkkoHN940XNS https://www.youtube.com/watch?v=c5JfH-rCC_A