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Waves

Waves. So far have only looked at periodic motion that is periodic in time. Can also have periodicity in space. Characteristics of Waves. In addition to amplitude, period and frequency, also have wavelength. Wavelength is the distance covered by a cell of periodic motion Two classes of waves

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Waves

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  1. Waves • So far have only looked at periodic motion that is periodic in time. • Can also have periodicity in space

  2. Characteristics of Waves • In addition to amplitude, period and frequency, also have wavelength. • Wavelength is the distance covered by a cell of periodic motion • Two classes of waves • Mechanical waves • Requires external source of energy • Requires medium to travel through • Electromagnetic waves • Carries its own energy • Does not need a medium

  3. Types of waves • Transverse • Changes in amplitude are perpendicular to motion of wave • Longitudinal • Changes in amplitude are parallel to motion of wave • Solitons • Solitary wave fronts that propagate by themselves

  4. Speed of wave • Recall that • In one period, T, the wave travels a distance equal to the wavelength, l. Hence • For mechanical waves, the speed is determined by the medium

  5. Waves on a string • The most common wave is a transverse wave on a string. • The speed of the wave depends on the tension in the string • The tighter the string, the faster the wave can move • The heavier the string, the more resistance it has to motion

  6. 60 0 of 1 Answer Now Can the equations of kinematics that we studies be applied to an object moving in one dimension with simple harmonic motion? • Yes • Only when the velocity is constant • Only during the instants when the acceleration is constant • No

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