## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

(a) $f = 1.0\times 10^{10}~Hz$ (b) $t = 1.7\times 10^{-4}~s$
(a) We can find the frequency of microwave radiation with a wavelength of 3.0 cm. $f = \frac{v}{\lambda}$ $f = \frac{3.0\times 10^8~m/s}{0.030~m}$ $f = 1.0\times 10^{10}~Hz$ (b) We can find the time it takes the signal to travel from one mountaintop to the other. $t = \frac{d}{v}$ $t = \frac{5.0\times 10^4~m}{3.0\times 10^8~m/s}$ $t = 1.7\times 10^{-4}~s$