Resonance cavity concept is based on ___________Select one:a. Standing wavesb. Reflection on metallic plates c. Electromagnetic waves oscillatio

The concept of a resonance cavity is based on standing waves.

Here's a step-by-step explanation:

1. A resonance cavity, also known as a resonator, is a device or system that selectively amplifies certain frequencies.

2. This is achieved by creating a space where waves can bounce back and forth. When the length of this space is a multiple of half the wavelength of the wave, the reflected waves will align with the incoming waves.

3. This alignment causes constructive interference, where the peaks and troughs of the waves align and add together. This results in a standing wave, which appears to be standing still because the points of maximum and minimum displacement (the nodes and antinodes) do not move.

4. Therefore, the concept of a resonance cavity is based on standing waves, as it is the constructive interference of these waves that allows certain frequencies to be amplified.

So, the correct answer is a. Standing waves.