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Wave Motion and Sound

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	Introduction
	Simple Pendulum and Restoring Force
	Simple Pendulum - Time Period of Oscillation Varies with Time
	Forces Acting on the Bob of a Simple Pendulum
	Waves and Wave Motion
	Mechanical Waves and Electromagnetic Waves
	Longitudinal and Transverse Waves
	Graphical Representation of Waves
	Wave Pulse and Periodic Waves
	Wavelength, Frequency and Time Period
	Sound
	Speed of Sound
	Practical Applications of Reflection of Sound
	Summary
Animations
	Simple Pendulum
	What Stops an Oscillating Pendulum?
	Sound Propagation Requires a Material Medium
	Calculation of Velocity of Sound
	Reflection of Sound - Applications
	Echo Location
	Determination of the Depth of an Ocean by Echo Sounding
	Acoustics of Buildings

Subjects
English
Math
Geometry