Chapter 13 Lesson 1

Vocabulary Matching Match the vocabulary word with the correct definition. vibration a quick back and forth motion pitch a measure of how high or low a sound is intensity a of how loud or soft a sound is Page 532 When something vibrates the air around it vibrates too. Then the vibrations move through the air. They travel out in all directions. When they reach your ear you hear them as sounds. True or False: Sound can travel through solids and liquids as well as gasses. True False Page 533 The vibrations that carry sounds are called sound waves. Pitch - page 534 Smaller objects usually vibrate faster than larger ones. They make sound waves that are close together. Big objects vibrate more slowly. They produce sound waves that are more spread out. Intensity - page 535 Sound waves have a certain amount of energy. A heavier book would have more energy when it hits the floor, so it would produce sound waves with more energy. The sounds you produce when you whisper don't have as much energy as the sound waves you produce when you shout. You hear sound waves with more energy as louder sounds. Sort the sounds into high intensity sounds or low intensity sounds. High Intensity jet engine football game highway traffic Low Intensity pin dropping leaves rustling students whispering Sound is measured in ... inches decibels vibrations intensity