# Chapter 20 - Traveling Waves - Exercises and Problems: 22

(a) $f = 6.7\times 10^{14}~Hz$ (b) $f = 4.6\times 10^{14}~Hz$

#### Work Step by Step

(a) We can find the frequency of blue light with a wavelength of 450 nm. $f = \frac{v}{\lambda}$ $f = \frac{3.0\times 10^8~m/s}{450\times10^{-9}~m}$ $f = 6.7\times 10^{14}~Hz$ (b) We can find the frequency of red light with a wavelength of 650 nm. $f = \frac{v}{\lambda}$ $f = \frac{3.0\times 10^8~m/s}{650\times10^{-9}~m}$ $f = 4.6\times 10^{14}~Hz$

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