16. Write the formula of specific heat??
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17. What is refraction?
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Refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.
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16.The specific heat capacity us the amount of energy of energy required to raised the temperature of 1 kg of substance to 1 C.the symbol are (c)
17.The refraction is a process in which their ia a bending of light occur when they move from different phase.
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