while expressing wave length in frequency wave length of violet, 400 is become 400×10^-9.How it happens?
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Answer:1 nm = 1e-9m (1 times 10 to the power -9); the basic formula for wavelenght and frequency is: (speed of the wave) = (wavelength) x (frequency); therefore, since the speed of light is 300e6 m/s, the frequency is 300e6 / 400e-9 = 0.75e15 or 750e12 (750 trillion cycles per second).
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