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# What is the frequency in hertz of blue light having a wavelength of 425 nm?

Nov 3, 2015

$7 , 0588 \times {10}^{14} H z$
$c = f \lambda$
$\therefore f = \frac{c}{\lambda} = \frac{3 \times {10}^{8} m / s}{425 \times {10}^{- 9} m} = 7 , 0588 \times {10}^{14} H z$