PHY 131 Study Guide - Midterm Guide: Wind Wave, Boundary Value Problem, Helmholtz Resonance
2 Mar 2018
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Study guide for exam 1: know the two definitions of sound (objective and subjective, sound propagation requires a medium, e. g. air or other gas, but also liquids and solids can serve as the medium. There is no sound in outer space (no medium) No sound propagation on the surface of earth"s moon, as the moon is too small to have an atmosphere. Periodic motion: be able to read a displacement vs. time graph and identify cycle time, period, amplitude, phase, damping on a graph, given the period be able to determine the frequency and vice versa. The period is measured in seconds; frequency is measured cycles per seconds, often abbreviated as 1/s or hz (hertz). Changing he mass of a spring oscillator changes its period, but changing the mass of a pendulum does not affect its period. To double the period of spring oscillator, we have to increase the mass by a factor of four.
