When two waves with the same wavelength are in phase and interact, they undergo constructive interference. Constructive interference occurs when the peaks of one wave align with the peaks of the other wave, resulting in an amplified or reinforced wave. The individual wave amplitudes add up, leading to an increased overall wave amplitude.
As a result of constructive interference, the combined wave will have a larger amplitude and appear more intense. This phenomenon is commonly observed when waves from two sources, such as speakers or water waves, meet and combine constructively, creating regions of higher intensity or louder sound.