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Bell, Alarm Clock, Guitar, Lightbulb, Flashlight.
Heat, light, and sound are all forms of energy. Heat can be transferred by radiation, conduction and con- vection. Visible light can be produced, reflected, refracted, and separated into light of various colors.
Sound : Announcers and Speakers
Heat : Fire and Sun
Light : Lightbulb and Flashlight
One of the most important facts to understand about both light and sound is that both are forms of energy that move in waves. While they are both forms of energy that travel in the form of waves, there are vital differences between sound waves and light waves. Sound and light travel at significantly different speeds.
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