Acoustic phenomena refer to various sound-related events and behaviors that occur in different environments. These can include echoes, which happen when sound waves reflect off surfaces, and resonance, where an object vibrates at specific frequencies. Understanding these phenomena helps in fields like music, architecture, and environmental science. Another important aspect of acoustic phenomena is sound waves, which are vibrations that travel through air, water, or solids. The study of these waves includes their speed, frequency, and amplitude, all of which influence how we perceive sound. Applications of this knowledge can be found in technologies like ultrasound and sonar.