1. SOL 5.2

2. Sound is a form of energy produced by vibrating matter
Sound is a form of energy produced by vibrating matter. It travels in waves.

3. Draw this diagram of a sound wave
Draw this diagram of a sound wave. You need to know the crest, the trough, the amplitude, and a wavelength.

4. When sound energy is released from a source, the molecules in something absorb the energy, start to vibrate, and affect the other molecules around it.

5. Sound waves travel by the molecules compressing and releasing – in waves.

6. Because sound needs molecules to move, sound cannot travel in a vacuum.

7. Resonance is the vibrations that sound makes

8. High frequency sound waves are so strong the vibrations they create can make glass break

9. Different sound waves have different frequencies
Different sound waves have different frequencies. Frequency measures how many sound waves in one second.

10. The frequency of a sound determines its pitch
The frequency of a sound determines its pitch. The higher the frequency, the higher the pitch

11. Different animals make sounds with different frequencies, and they can hear different frequencies

12. Amplitude is the volume of a sound
Amplitude is the volume of a sound. This is determined by the amount of energy put into a sound. The higher the sound wave, the louder the sound will be.

13. An echo happens when sound waves hit an object and bounce back

14. Echolocation is something some animals use to “see” using sound waves

15. Sonar is something people use to “see” objects under water by using sound waves.
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16. Sound travels through different mediums differently

17. Because sound needs these molecules in order for them to travel, you can see why it travels best in a medium that has more molecules to carry the sound energy.