PHY 131 Study Guide - Midterm Guide: Preamplifier, Audio Power Amplifier, Shepard Tone
25 Apr 2016
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Absolute pitch is possessed by less than 0. 01% of the population. Shepard tones: continually seem to ascend/descend. Ideal spring = amount of stretch is proportional to the stretching force. K = spring constant (n/m: small k = loose spring, large k = stiff spring. For example, a slinky would have a small k . Vertical spring kx = mg -> k = mg/x. A spring is 10 cm long, and has 1 kg pulling on it, what is the k force. X = 0. 1m, m = 1kg, g = 9. 8 m/s^2. Frequency (f) = # of oscillations per second. Period (t) = # of seconds per oscillation. Find frequency and period, f = 1/2pi * root(k/m) k = 98 n/m, m = 1kg. Helmholtz demonstrated that sounds consist of series of harmonics that determine the timbre. Soft, pleasant sounds free from roughness but dull at low frequencies: ex: tuning forks.
