1 / 16

Sound

Sound. Physics - Arrowhead Mr. Streufert 2013-14. Learning Targets. Apply wave concepts to the physical and perceived characteristics of a sound wave Perform calculations involving speed and intensity Detect audibility and harmonic relationships. Learning Targets.

oakley
Download Presentation

Sound

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sound Physics - Arrowhead Mr. Streufert 2013-14

  2. Learning Targets • Apply wave concepts to the physical and perceived characteristics of a sound wave • Perform calculations involving speed and intensity • Detect audibility and harmonic relationships

  3. Learning Targets • Relate waveform and FFT graphs to simple or complex sounds • Changes in Frequency • Identification of frequencies • Explain the multiple frequencies in a complex tone

  4. Learning Targets • Describe and explain sound phenomena • Resonance • Patterns of interference creating change in frequency • Doppler Effect

  5. Learning Targets • Calculate, predict and relate changes in the sound characteristics that affect sound phenomena • Calculate wavelengths and frequencies of sounds produced by different instruments (strings, tubes, etc.) • Use interference patterns (standing wave analysis) • Calculate the sound wave changes based on the motion of the source and/or the observer

  6. Learning Targets

  7. Audibility • Audibility: The ability for sound to be heard • Sound Test Demonstration

  8. Audibility • Speed • Frequency • Wavelength

  9. Audibility • Infrasonic: Sounds below 20 Hz • Ultrasonic: Sounds above 20,000 Hz

  10. Audibility – Range of Hearing

  11. Intensity • Intensity: The amount of power per unit area • Need to know: • Power of the source of sound • Distance away from source • Sound Waves travel outward from the source in a sphere

  12. Intensity • Relative Intensity: The intensity of sound in relation to the threshold of hearing • Measured in decibels • Based on a Logarithmic Scale • Measurements span a very large range of values

  13. Practice Question #1 • If a sound seems to be getting louder, which of the following is probably increasing? • Intensity • Frequency • Speed of Sound • Wavelength

  14. Practice Question #2 • Using the table on the Audibility Handout, estimate the decibel level of the following sounds: • A cheering crowd at a football game • Background noise in a church • The pages of a book being turned • Light traffic on the road

  15. Practice Question #3 • A stereo speaker emits sound waves with a power output of 10 W. • What is the intensity (W/m2) of the sound 10 m away? • What is the relative intensity (decibel level)?

  16. Practice Question #4 • What is the power of a sound source if the intensity at 2.8 m is 5.4 x 10-3 W/m2?

More Related