Choices: Decibel Energy Frequency Intensity Longitudinal Louder Noise Pitch Vaccum Vibration Volume Water ••••••• 1. The speed ofithe vibration is called 2. The loudness or softness of a sound is 3. Sound is a form of 4. A back and forth movement that produces sound is called a 5. Sound waves are waves. 6. The higher the amplitude, the the sound. 7. The standard unit of sound is 8. Sound can travel in all media but not in 9. A distorted sound which is not pleasing to the senses is 10. The higher the frequency, the higher is the of the sound produced . . pahelp