Answer
See the answer below.
Work Step by Step
Since $c=\nu\times\lambda$:
a) $\lambda=2.998\times10^8\ m/s\div1150 \times10^3\ 1/s=260.7\ m$
Ratio: $225/260.7=0.86$ wavelengths.
a) $\lambda=2.998\times10^8\ m/s\div98.1\times10^6\ 1/s=3.06\ m$
Ratio: $225/3.06=73.6$ wavelengths.
