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Demonstrating Wave Phenomena
To demonstrate wave phenomena such as refraction, reflection, and diffraction, various lab activities can be conducted using different materials and equipment. Here's how these phenomena can be demonstrated using a glass slab, mirror, and ripple tank:
Reflection
Reflection occurs when waves bounce off a barrier and change direction, similar to how light reflects off a mirror. In a ripple tank, reflection can be demonstrated by placing a straight barrier (e.g., a metal strip) in the tank. When waves encounter the barrier, they bounce off it and change direction, illustrating the principle of reflection
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Refraction
Refraction happens when a wave changes direction as it passes through a boundary between different materials, like light bending as it passes from air to water. In a ripple tank, refraction can be demonstrated by showing how waves change speed when traveling from deep water into shallow water or vice versa. Submerging a sheet of glass in the water to provide an area of shallower water can help illustrate this phenomenon. When waves encounter the boundary between deep and shallow water, they change direction, demonstrating refraction
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Diffraction
Diffraction can be shown in a ripple tank by placing small barriers and obstacles in the tank. When water waves encounter obstacles or barriers, they can be seen to spread out, demonstrating the principle of diffraction. This can be observed as the waves spread out when encountering obstacles or the edge of an obstacle in the tank
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In addition to the ripple tank, other materials such as glass slabs and mirrors can also be used to demonstrate these wave phenomena. For example, the focusing of waves by a parabolic mirror can demonstrate the law of reflection, and the change of wavelength with frequency and/or speed can illustrate the concept of refraction
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