- Superposition of waves
- Principle of superposition: Finding the resultant of two waves which meet at a point by adding up the displacemnt.
- Diffraction of waves: Is the spreading of a wave as it passes through a gap or around an edge. Ripple tank can be used to show diffraction.
- If the width of the gap is much greater than wavelength there is very low diffraction.
- If the gap width is equal to the wavelength diffraction is greatest.
- Sound waves diffract as they pass through doorways.Width of a doorway is comparable to wavelength of sound.
- Visible light has much shorter wavelength. Its not diffracted by doorways because the width of the gap is larger.
- Radio waves can have large wavelengths so easily diffracted by the gaps in hills
- Microwaves have wavelengths of 1 cm not easily diffracted
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