PHY 102 1nd Edition Lecture 14 Outline of Last Lecture I Santa Outline of Current Lecture I Waves II Sound Waves III Light Waves IV Intensity V Interference VI Diffraction Current Lecture I II III Waves a T period time it takes to make a complete oscillation b f frequency 1 T inverse of T i Number of oscillations per second ii Unit 1 s s 1 cps cycle per second rps revolution per second c Wave is a disturbance in a medium that moves d Top crest bottom trough e Wavelenght distance between two consecutive crests or troughs f v distance time i one wavelength one period T f g Transverse wave oscillation is perpendicular to the direction of motion of wave h Longitudinal wave oscillation is in the same direction as wave motion i Speed of a wave is constant regardless of or f Sound Waves a Speed 340 m s b Frequency can be anything i Audible frequency 20 20 000 Hz 1 Example ultrasound is 100 000 Hz c Longitudinal Light Waves a Speed c 300 000 km s 3x108 m s b Wavelength can be anything i Visible wavelength 400 700 nm 0 4 0 7 m 0 4x10 6 0 7x10 6 m These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 1 0 4 violet 0 7 red IV V VI Intensity a Sound loudness b Light brightness c I is proportional to Amplitude 2 i The higher the amplitude the more intense the wave is Interference a Sources that produce waves in unison are called coherent sources b Two coherent sources produce interference i Destructive regions no wave ii Constructive regions between two destructive regions c Criterion for two coherent sources to produce interference i Distance between two holes 10 Diffraction a One hole b Criterion for diffraction to take place i Size of hole aperture 10 c for light 0 5x106 m 10 0 5x10 5 m 0 005 mm i A drill hole 1 cm but you need a much smaller hole reason why you don t see diffraction
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