Lecture13_ Ch13_Part1

# The wave motion there is an organized motion of an

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The wave motion there is an organized motion of an entire medium or parts of that medium in response to a disturbance . Note: Light and other electromagnetic waves propagate in empty space. Why? 2. Period and Frequency Let us consider an ideal wave propagating in a medium ( infinite both in space and time) This ideally periodical wave (which is called also a harmonic wave) can be described by a sine curve. High points of a sine curve are called the crests ; and the low points - the troughs . Main characteristics of a harmonic wave are the following: 1. Wavelength ( ! ) – the distance between, i. g., two nearest crests. 2. Amplitude (A) - the distance from midpoint to the crest. 3. Frequency (f)– how frequently vibration occurs 4. Period (T) - the time required to complete one vibration Period = 1/ frequency or T = 1/f The SI unit of frequency is the hertz 1 Hz is one vibration per second. History: Heinrich Hertz (February 22, 1857 - January 1, 1894) was the German physicist and mechanician for whom the hertz, an SI unit, is named.

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3 3. Wave energy and wave speed Why do we say that waves transport the energy? A wave propagating in a medium k th ti l f makes move the particles of the medium thus transporting kinetic energy through the medium. Wave speed Definition: Wave speed = wave length/ period or Wave speed = frequency x wavelength Period V Wave speed is determined by the medium properties!
• Fall '08
• Khankasayev
• Frequency, Heinrich Hertz

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