1. Sound Notes

2. Sound Sound is created by a vibration
It is a mechanical wave(longitudinal)
Requires a medium
DEMO

3. Speed of Sound Speed of sound is dependent on the:
Medium –the more dense the medium the _______
Temperature-the higher the temp the ______. About .6m/s per degree increase
Altitude – the higher the altitude the _____
343 m/s super sonic

4. Frequency Number of vibrations per second
It is a quanitative value measured in ________

5. Pitch It is a qualitative value It is directly related to frequency
Hi Freq= Hi pitch/Low freq=Low pitch

6. Loudness Loudness can be qualitative value or It can be quanitative
It is directly related to amplitude

7. Amplitude Amplitude is the amount of energy in a wave
It is directly related to loudness

8. Decibels The units to measure loudness of a sound quanitatively
It is a log scale
What is a Decibel?

9. Decibels

10. Resonance Ability of an object to vibrate at its natural frequency
watch to the 2:20 mark of this one

11. Resonance Ability of an object to vibrate at its natural frequency
Hair Trick

12. Reflection
It is the bouncing back of a wave. In sound it is an________.

13. Echolocation The use of sound to locate objects
Some species of animals use it to locate prey ex. bats, dolphins

14. SONAR Acronym that represents Sound Navigation and Ranging
Used to detect objects underwater
New technology used in WWII
What is SONAR

15. Ultrasound A sound greater than 20,000Hz
Used in medicines to diagnose disease
Humans can only detect sounds from 20Hz-20,000Hz
Tone Generator and Beat

16. Interference Constructive – consonance – a pleasant set of pitches
Destructive – dissonance – an unpleasant set of pitches
Interference waves

17. Beat
Oscillation of wave amplitude that occurs as a result of the superposition of two sound waves having nearly identical frequencies.
Tone Generator and Beat

18. Octave
Two musical notes with frequencies related by a 1:2 ratio.

19. Doppler Effect/ Shift
An apparent change in sound frequency due to relative motion of either the source or the detector.
Ex. – radar gun, astronomy, meteorology, train, sirens…