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April29th_2008

# April29th_2008 - 97.5 A A AAB 20 15 10 5 Midterm 1 Results...

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1 Midterm 1 Results Mean = 80.9 Median = 82.5 MIDTERM1 100.0 95.0 90.0 85.0 80.0 75.0 70.0 65.0 60.0 55.0 50.0 30 20 10 0 Std. Dev = 10.74 Mean = 80.9 N = 121.00 0 5 10 15 20 25 30 A+ A A- B+ B B- C+ C C- D+ D D- Frequency 97.5 A+ 95 A 92.5 A- 90 A- 87.5 B+ 85 B 82.5 B- 80 B- 77.5 C+ 75 C 72.5 C- 70 C- 67.5 D+ 65 D 62.5 D- 60 D- Your final grade is based on the average across 3 midterms and the final exam. Remember, your grade on the final exam can replace your lowest grade Tentative Grading Distribution Audition Sound Hearing involves the detection of sound waves Usually detect sound waves traveling through air – Can also detect sound waves in liquids (swimming/diving) and solids Components of Sound Pure tone – a tone with a single frequency number of cycles – of vibration Hertz ( Hz ) – cycles per second of sound wave, perceived as pitch Components of Sound Amplitude or intensity – perceived as loudness A fundamental is the basic frequency harmonics are multiples of it. Timbre – characteristic sound quality of an instrument

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2 Å Fundamental frequency Frog Wave Form Measuring Sound Fourier analysis – a mathematical process used to analyze sounds as the sum of sine waves Decibel ( dB ) – a measure of sound intensity Examples of decibel levels 20 dB Rustling leaves 40 dB Quiet room • 80dB Lecturer 110dB Rock concert (you can feel vibrations, short term hearing loss) 180 dB Spacecraft launch Figure 9.1 External and Internal Structures of the Human Ear (Part 1) Middle Ear The middle ear concentrates sound energies. Muscles in the can stiffen and reduce sound’s effect