A transmitting mast emits microwaves with wavelength $1.5\,\text{cm}$ and radio waves with wavelength $1.5\,\text{km}$. A receiving aerial located behind a mountain can pick up the radio waves, but it cannot detect the microwaves. What is the reason for this?
- AThe radio waves are coherent but the microwaves are not.
- BThe radio waves are diffracted around the mountain but the microwaves are not.
- CThe radio waves are reflected by the mountain but the microwaves are not.
- DThe radio waves travel at the speed of light but the microwaves do not.