Properties of Sound Waves

1. Properties of Sound Waves

2. Wavelength • Wavelength is the distance between two troughs or crests on the waves

3. Amplitude • Amplitude is the height of the wave. The higher the amplitude the higher the volume.

4. Frequency • Frequency is the number of times the wavelength occurs in one second.

5. Hertz • 1 hertz = I vibration per second

6. Compressions and Rarefactions • Compressions are the when the waves have lots of particles all bunched up in it and the rarefactions are the spaces or low parts in between the waves

7. Pitch • The pitch is how high or low a sound is. A high pitch is make by high frequency sound waves. A low pitch is made by low frequency sound waves.

8. Loudness • The loudness of a sound is determined by the amplitude of the wave. The greater the amplitude the louder the noise

9. Doppler Radar Jared Wallace

10. Doppler Radar • This method is being used today by Meteorologists to discover even more about weather conditions. Particularly, severe weather such as tornadoes and harsh thunderstorms. Doppler radar can see more than rain and other types of precipitation. It’s able to see the winds inside storms. In some cases, it can even track insects and dust particles and tell a Meteorologists what winds are doing in regions where there is no rain. When tornadoes develop they carry rain droplets around in a circle. Doppler radar can even see the raindrops going in random directions and tell a forecaster specifically where the tornado is in some cases.

11. Doppler Radar for February 25, 2008 February 21, 2008

15. HARMONICS ALEX H is awesomer than you are!!

16. Waves • The simplest wave on a guitar string is a sinusoid, when the string is plucked in its center. This creates a pure tone. • The sinusoid creates the fundamental harmonic, or the string’s natural frequency. This is the string’s lowest possible frequency.

17. More Waves>>>>>>>>>>>>>>>>>>> • As the sinusoid vibrates into an arch, if the string is picked, then it creates a triangular wave, the vertices being the nodes (ends of the string) and the point to where you picked the string out to. • The closer together the nodes, the higher the frequency (pitch). The pitch can also be changed by adjusting the tightness and thickness of the string.

18. The HARMONIC Sequence • The first harmonic is the fundamental, or the pitch of the open string. • The following harmonics are found by multiplying the fundamental’s frequency by the number of the respective interval. For example, if the fundamental frequency is 150, the second harmonic is 300, and the third harmonic is 450.

19. The Intervals of the Harmonic Sequence • In the terms of musical intervals, the second harmonic is an octave above the fundamental. The third harmonic is an octave and a fifth above the first, and the fourth harmonic is two octaves above the fundamental. The fifth is 2 octaves and a third above the fundamental, the sixth is an octave and a fifth above the fundamental, and so on.

20. Review Game • Same rules apply

21. 1 • What is the distance between two troughs or crests on the waves? • A. Hertz • B. Amplitude • C. Wavelength • D. Frequency

22. Answer • Wavelength

23. 2 • The simplest wave on a guitar string is a , when the string is plucked in its center. This creates a pure tone? • A. Sinusoid • B. Harmonics • C. Triangular Wave • D. Fundamental

24. Answer • Sinusoid

25. 3 • Doppler Radar is used primarily by who and for what purpose ? • A. Meteorologists; sound waves • B. Pediatricians; weather conditions • C. Science professors; amplifying microscopes • D. Meteorologists; weather conditions

26. Answer • Meteorologists; weather conditions

27. 4 • What does the sinusoid create?

28. Answer • The fundamental harmonic, or the string’s natural frequency. This is the string’s lowest possible frequency.