Question

Calcule a frequência de uma onda de 20 nm , sabendo que c= 3,0 x 108 m/s.
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Answer 1

$\lambda = 20nm = 20 \cdot 10^{-9}m\\v = c = 3,0 \cdot 10^8m/s\\\\v = \lambda f\\f = \frac{v}{\lambda}\\f = \frac{3,0 \cdot 10^8}{20 \cdot 10^{-9}}\\f = 0,15 \cdot 10^{8+9}\\f = 0,15 \cdot 10^{17}\\\boxed{f = 1,5 \cdot 10^{16}Hz}$