In an experiment, the microwaves have a frequency of $3.0 \times 10^9\,\text{Hz}$. In air, their speed is $3.0 \times 10^8\,\text{m s}^{-1}$. Give one possible frequency and one possible speed in air for a radio wave?
- Afrequency $3.0 \times 10^5\,\text{Hz}$, speed $1500\,\text{m s}^{-1}$
- Bfrequency $3.0 \times 10^5\,\text{Hz}$, speed $3.0 \times 10^8\,\text{m s}^{-1}$
- Cfrequency $3.0 \times 10^{14}\,\text{Hz}$, speed $1500\,\text{m s}^{-1}$
- Dfrequency $3.0 \times 10^{14}\,\text{Hz}$, speed $3.0 \times 10^8\,\text{m s}^{-1}$