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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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