1. SOUND

2. Sound
Sound is a form of energy that is produced and transmitted by vibrating matter.
A vibration is a back and forth motion.

3. Sound
A wave is a disturbance that transfers energy from place to place.
A compression wave is made by sound, it moves energy outward from its source.

4. Sound
Compressions: parts of the wave where particles are closer together
Rarefactions: parts of the wave where particles are spread out

5. Sound
Medium: material through which sound waves travel (solids, liquids, or gases)
Sound must have a medium in order to travel, no medium = no sound

6. Why can the sound below not be heard?

7. Sound Sound travels the quickest through solids
Sound travels the slowest through gases

8. Which of the following does sound travel through the quickest?
How do you know that sound travels the quickest through this substance?

9. Frequency
Frequency is the number of vibrations in a given unit of time
It is measured in Hertz

10. Pitch Pitch describes how high or low a sound is
It is determined be frequency
Objects vibrating faster have a higher pitch
Objects vibrating slower have a lower pitch

11. Which one do you think produces a higher pitch?
The large tuba or the smaller trumpet?
Which one has a higher frequency? How do you know?

12. Which one do you think has the most vibrations per second?
The smaller string or the fatter string?
What does that mean about the pitch of each?

13. Wavelength Measures the distance between one compression to the next
The longer the wavelength the less frequency.
The shorter the wavelength the more frequency.

14. Which wave has a greater wavelength?
What does the wavelength mean for the frequency of the wave?

15. Amplitude Amplitude is the height of a wave
Higher amplitude = louder sound
Lower amplitude = softer sound

16. Volume Volume is how loud or soft a sound is
more energy makes a louder sound
Less energy makes a softer sound
Volume is measured in decibels
If amplitude increase volume increase

17. Which part of the wave has a higher amplitude?
What does that mean about the wave’s volume?