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Waves

Waves. Paul Driver 3 rd Period Ap Physics. Objectives. In this PowerPoint the students will learn: The properties of a wave Behavior of Waves Differentiate elastic & electromagnetic waves How to calculate the period, frequency, and wave length of a wave. Elastic Example: Water waves

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Waves

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  1. Waves Paul Driver 3rd Period Ap Physics

  2. Objectives • In this PowerPoint the students will learn: • The properties of a wave • Behavior of Waves Differentiate elastic & electromagnetic waves • How to calculate the period, frequency, and wave length of a wave.

  3. Elastic Example: Water waves Sound waves Waves on a spring or string Mechanical (Elastic) waves need a medium to travel Mechanical waves transport energy and not material Electromagnetic Example Microwave X-ray, Gamma ray Light waves, UV rays Do not need a medium to travel It travels with very high speed Can be described by their wavelength, energy, and frequency Differentiate

  4. Requires initial energy input be created Mechanical waves cause displacement of the matter through which the wave is traveling Mechanical waves vibrations can put air molecules in motion Very low energy and frequency wavelength Electromagnetic waves cause no displacement of matter and can transfer energy in the absence of matter Do not need to take place in any media vibrations Very high energy and frequency Electromagnetic vibrations do not put our molecules in motion Cont’d

  5. What is a wave? • A wave is a disturbance which moves through a medium. • Water waves and sound waves are examples of mechanical waves. Light waves are not considered mechanical waves. However, most of the mathematics and reasoning of mechanical waves are applied to light waves.

  6. Terminology • Amplitude: Height of Wave (m) • Wave Length: distance from one wave top, or crest, to the next. (m) • Phase Shift: how far to the left or right the wave slides. (m) • Frequency: refers to how many waves are made per time interval. This is usually described as how many waves are made per second, or as cycles per second. (hz) Crest: top most part of the wave Trough: bottom most part of the wave Period: the time needed to repeat one complete cycle of motion.

  7. Problem #1 • What is the speed of a periodic wave disturbance that has a frequency of 3.5 Hz and a wavelength of 0.7 m? • V= f x • V=

  8. Problem #1 • What is the speed of a periodic wave disturbance that has a frequency of 3.5 Hz and a wavelength of 0.7 m? • V= f x • V= 3.5 x 0.7= 2.45 m/s

  9. Problem #2 • An ocean wave has a length of 12.0 m. A wave passes a fixed location every 3.0 s. What is the speed of the wave? • v= d / t • v= (12/3)= 4.0 m/s

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