Sounces back. The sound wave that bounces back is called an echo. Write True if the statement is correct and False if the statement is incorrect. J. Light can be reflected if it is directed towards a mirror. 2. The speed of light remains the same even if it travels from one material to another. 3. Sound could be either soft or loud. 4. The loudness of sound decreases as it moves nearer the observer. 5. Echo is the term used for the sound that is reflected back to its source. 6. Sound is a form of energy produced by a vibration or a back and forth movement 7. Sound is a wave of vibrations that spread from its source of its matter. 8. The more vibrations the waves have, the more energy, the louder the sound. 9. The faster the vibrations or the frequency, the higher the sound. 10. Sound travels in waves of an object.​