Answer
(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.
$f = \frac{v}{\lambda}$
$f = \frac{3.0\times 10^8~m/s}{650\times10^{-9}~m}$
$f = 4.6\times 10^{14}~Hz$
