Two waves, travelling in the same direction through the same region, have equal frequencies, wavelengths and amplitudes. If the amplitudes of each wave is 4 mm and the phase difference between the waves is 90 ° , what is the resultant amplitude?

Two waves, travelling in the same direction through the same region, have equal frequencies, wavelengths and amplitudes. If the amplitudes of each wave is 4 mm and the phase difference between the waves is 90°, what is the resultant amplitude?

Phase difference between them is of angle.

So, suppose two equation of wave are,

Now,

Computing these we get,

SO, amplitude is

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