A barrier with a small opening separates a single medium into two regions. Plana

Question

A barrier with a small opening separates a single medium into two regions. Planar waves incident upon the barrier pass through the opening. If the width of the opening is about the same as the wavelength, which of the following, if any, hold true? The waves will be planar on both sides of the barrier. The wavelength will be the same on either side of the barrier. The amplitude of the waves will be the same on both sides of the barrier. The waves will diffract as they pass through the opening. The waves will spread out as they pass through the opening. The speed of propagation will be the same on either side of the barrier.

Explanation / Answer

not planar on both side on the other side after opening it turns into circular wavefront.

Yes the wavelength is same on both sides

No the amplitude decreases

Yes they will diffract since the wavelenght is small

yes the waves will spread out

Yes the speed is same on both sides

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