NATS 1745 Lecture Notes - Lecture 7: Diffraction, Wind Wave, Record Producer

• School: York University
• Department: Natural Science
• Course: NATS 1745
• Professor: Robin Metcalfe

Document Summary

7. 1. 1 wave: an oscillating disturbance that travels through matter or space. Longitudinal: disturbance is in same direction as wave is travelling (eg, sound) Transverse: disturbance is perpendicular to direction wave is travelling (eg, water. 7. 1. 3 amplitude: height of a wave crest (determines intensity, brightness, volume, etc) 7. 1. 4 wavelength (l or ): distance between adjacent crests (determines colour, pitch, etc) Audible sound waves have l between 1cm-20m (millions of times longer than light waves) 7. 1. 5 period (t): time between successive wave crests. 7. 1. 6 frequency (f) = # of wavelengths leaving source each second (measured in hertz; V = f l (the wave equation) 7. 1. 7 wave speed (v): travelling speed of disturbance (depends on medium) 7. 2. 1 refraction: the bending of a wave when it travels from one medium into another. Constructive interference results in higher amplitude, destructive interference results in lower amplitude. 7. 2. 3 diffraction: spreading or bending of waves when they encounter openings or barriers.