1. What is a wave?
A wave is simply a movement of energy that travels through a medium…

2. Types of Waves
Slide 15-8 2

3. How to graph a wave?

7. Do U get it? Assume V ~ constant 1) Quiet sound, low frequency:
2) Quiet sound, high frequency:
3) Loud sound, low frequency:
4) Loud sound, high frequency:

8. Main Waves Types: Transverse
Transverse waves are when the displacement is at right angles to the direction of the wave…
Displacement
Direction
Examples include waves in water, strings, earthquakes…

9. 03/05/2019

10. Longitudinal waves
Displacement
Longitudinal waves are when the displacement is parallel to the direction of the wave…
Direction
Examples sound waves, springs
and earthquakes (P waves)...

11. Compare a longitudinal wave in a slinky to a sound wave in a tube:

12. A = pressure amplitude = max. change in pressure
very small for common sounds ( 3x10-2 Pa)
Loudness is related to pressure amplitude

13. Frequency (Pitch) of Sound Waves: number of cycles per second
Healthy young ears can hear frequencies between:
20 Hz
20,000 Hz
Infrasonic
Which end do we lose with age?
Ultrasonic
Pure tone – a single frequency sound
(most sounds are composed of many frequencies)

14. Sound can travel through any kind of matter, but not through a vacuum.
The speed of sound is different in different materials; in general, it is slowest in gases, faster in liquids, and fastest in solids.
The speed of sound is different in different materials; in general, it is slowest in gases, faster in liquids, and fastest in solids.
The speed depends somewhat on temperature, especially for gases.
The speed depends somewhat on temperature, especially for gases.