# lect543 - cord remains still are called nodes The points of...

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Wave Motion

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Conceptual Example: Wave and Particle Velocity Is the velocity of a wave moving along a cord the same as the velocity of a particle of a cord?
Distance between two successive crests is called the wavelength, λ . Important : The wavelength could be measured between any two identical points of the wave.

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The wave velocity, v , is the velocity at which wave crests (or any other point of the waveform) move. Important: Don’t confuse with the velocity of a particle, oscillating in a wave! f T v λ = =
Velocity of a Wave in a Stretched String

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Types of Waves transversal longitudinal
Energy Transported by Waves

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area power area time energy I = = /
Reflection and Interference of Waves

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Interference Interference refers to what happens when two waves pass each other.
Principle of Superposition In the region, where the waves overlap, the resultant displacement is the algebraic sum of their separate displacements. Crest is considered positive and trough negative.

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Standing Waves. Resonance
The points of destructive interference, where

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Unformatted text preview: cord remains still are called nodes . The points of constructive interference, where the cord oscillates with maximum amplitude are called antinodes . Important: the nodes and antinodes remain at fixed positions for a given frequency! Fundamental mode and first harmonic are the same! 1. When you yell at your friend, are the air molecules that strike his ear the same ones that were in your lungs? Explain. 2. Sonar devices use underwater sound to explore the ocean floor. Would you expect sonar to be a longitudinal or a transverse wave? 3. Which of the following properties affect the speed of waves along a rope: amplitude of the pulse, shape of the pulse, tension in the rope, and/or the mass per unit length of the rope? 1. How many antinodes are there when a rope fixed at both ends vibrates in its third harmonic? 2. How many nodes are there when a rope fixed at both ends vibrates in its fourth harmonic?...
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lect543 - cord remains still are called nodes The points of...

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