The relationship between frequency and wavelength for a wave is given by:
[tex]\lambda= \frac{c}{f} [/tex]
where
[tex]\lambda[/tex] is the wavelength
c is the speed of light
f is the frequency
Using the data of the problem, we can find the wavelength of the radio wave:
[tex]\lambda= \frac{3 \cdot 10^8 m/s}{1.5 \cdot 10^8 Hz}=2 m [/tex]