What station would have waves with higher energy 90.5 MHz or 107.1 MHz?

The station with higher energy waves is 107.1 MHz.

Radio waves are a type of electromagnetic radiation, and the energy of an electromagnetic wave is directly proportional to its frequency. Frequency is measured in hertz (Hz), and the higher the frequency, the more energy the wave has.

In this case, 107.1 MHz has a higher frequency than 90.5 MHz, so its waves have more energy.