Answer
$\lambda=1.62m$
Work Step by Step
Velocity, wavelength, and frequency are related using the formula $$v=f\lambda$$ Solving for wavelength $\lambda$ yields $$\lambda=\frac{v}{f}$$ Substituting known values of $f=1.75\times 10^8Hz$ and $v=c=3.00\times 10^8m/s$ yields a wavelength of $$\lambda=\frac{3.00\times 10^8m/s}{1.75\times 10^8Hz}=1.62m$$
