Final answer:
Resonance occurs when a system is driven or forced to oscillate at its natural frequency. The number of resonances increases with increasing frequency as there are more opportunities for the system to resonate and transfer energy, resulting in larger oscillation amplitudes.
Step-by-step explanation:
Resonance occurs when a system is driven or forced to oscillate at its natural frequency. At resonance, energy is transferred rapidly to the system, resulting in an increase in the amplitude of oscillations. In the context of frequencies, the number of resonances increases with increasing frequency because more resonant frequencies are reached. This leads to a greater number of opportunities for the system to resonate and for energy to be transferred to the system, resulting in larger oscillation amplitudes.