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Photo Album by Robert MacKay. Sound waves are longitudinal waves

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Presentation on theme: "Photo Album by Robert MacKay. Sound waves are longitudinal waves"— Presentation transcript:

1 Photo Album by Robert MacKay

2 Sound waves are longitudinal waves

3 Audible range 20 – 20,000 Hz decreases with age and damage

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8 Speed of sound in Air Depends of the air temperature. Higher air temperture the higher the speed. Depends of the molecular mass of air. Faster in helium, slower in air, and slower yet in Xenon.

9 During a lightning storm the thunder is heard 6 seconds after the flash. How far away was the lightning strike?

10 2 km

11 Speed of sound in Air Depends of the air temperature. Higher air temperture the higher the speed. Depends of the molecular mass of air. Faster in helium, slower in air, and slower yet in Xenon.

12 During a lightning storm the thunder is heard 10 seconds after the flash. How far away was the lightning strike?

13 2 miles

14 Speed of sound in solids Depends of the elasticity of solid. The stiffer the solid the higher the speed. Depends of the solid density. The lower a solids density the higher the speed.

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28 Beats The beat frequency is the difference between two frequencies.

29 Beats are used in tuning when tuning a guitar a beat frequency of 3 Hz is heard when comparing the sound from the guitar to 256 Hz tuning fork. What is the guitar strings frequency?

30 Beats are used in tuning when tuning a guitar a beat frequency of 3 Hz is heard when comparing the sound from the guitar to 256 Hz tuning fork. What is the guitar strings frequency? 253 or 259 Hz (cant say for sure which one)

31 Beats are used in tuning when tuning a guitar a beat frequency of 3 Hz is heard when comparing the sound from the guitar to 256 Hz tuning fork. The string is then slightly tightened and a beat frequency of 4 Hz is observed. What is the guitar strings frequency now?

32 Beats are used in tuning when tuning a guitar a beat frequency of 3 Hz is heard when comparing the sound from the guitar to 256 Hz tuning fork. The string is then slightly tightened and a beat frequency of 4 Hz is observed. What is the guitar strings frequency now? 260 Hz

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34 Decibel Sound Level

35 its actually easy intensity 10 (10 1 ) louder 10 dB higher intensity 100 (10 2 ) louder 20 dB higher intensity 1000 (10 3 ) louder 30 dB higher intensity 10,000 (10 4 ) louder 40 dB higher intensity 1,000,000 (10 6 ) louder 60 dB higher

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