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a wave vibrating in the direction of propagation.

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Refraction is the change in direction of wave propagation due to a change in its transmission medium. The phenomenon is explained by the conservation of energy and the conservation of momentum.

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the throwing back by a body or surface of light, heat, or sound without absorbing it.

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Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle.

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A substance, such as agar, in which bacteria or other microorganisms are grown for scientific purposes

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is a moving wave that consists of oscillations occurring perpendicular

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mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.

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Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point. The word comes from Latin vibration em.

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a long, narrow open container for animals to eat or drink out of.

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is the point on a wave with the maximum value or upward displacement within a cycle. ... A point on the wave is a trough if the displacement of the medium at that point is at a minimum.