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Published byNathanial Sander Modified over 2 years ago

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Condition for generating a stable interference pattern Coherent waves are two circular waves of same frequency, wavelength, amplitude and phase

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Coherent sources Coherent sources are the wave sources that produce coherent waves

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Constructive interference I When a crest meets a crest, the two waves reinforce each other

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Constructive interference II When a trough meets a trough, the two waves reinforce each other

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Destructive interference When a crest meets a trough, the two waves cancel each other

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X Path difference Path difference at X ＝ |S 1 X - S 2 X|

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Constructive interference Path difference = n, n = 0, 1, 2, …

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Destructive interference

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Antinodal lines (A) Antinodal lines : lines that link up the points of constructive interference of the same path difference

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Nodal lines (N) Nodal lines : lines that link up the points of destructive interference of the same path difference

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Increase the density of nodal and antinodal lines increase the separation of two sources

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Increase the density of nodal and antinodal lines decrease the wavelength

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Interference and energy redistribution According to the law of conservation of energy, energy cannot be created nor destroyed Interference is just a process of energy redistribution energy at the points of destructive interference energy at the points of constructive interference

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The End Video on ripple tank experiment

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Transverse or longitudinal waves transport energy from one point to another. Each particle in the medium vibrates or oscillates, and disturbs the neighbouring.

Transverse or longitudinal waves transport energy from one point to another. Each particle in the medium vibrates or oscillates, and disturbs the neighbouring.

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