waves

# waves - TopicList TypesofWaves Wavespeed LongitudinalWaves...

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Topic List Types of Waves Longitudinal Waves Transverse Waves Surface Waves Frequency Wavelength Period  Amplitude Wave speed Transmission of Waves Reflection  Refraction Superposition Principle Interference Diffraction Standing Waves    Resonance

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Waves   Information Marvin the Martian would like to send a message from Mars to Earth. There are two ways of sending a message. He could enclose the message in a rocket and physically send it to Earth. Or, he could send some type of signal, maybe in the form of radio waves. Information can be sent via matter or waves. If sent via waves, nothing material is actually transmitted from sender to receiver. If you talk to a friend, be it in person or on the phone, you are transmitting information via waves. Nothing is physically transported from you to your friend. This would not be the case, however, if you sent him a letter.
Waves   Energy  Suppose Charlie Brown wants to wake up Snoopy. Some energy is required to rouse Snoopy from his slumber. Like information, energy can also be transmitted via physical objects or waves. Charlie Brown can transmit energy from himself to Snoopy via Woodstock: Woodstock flies over; his kinetic energy is physically transported in the form a little, yellow bird. Alternatively, Charlie Brown could send a pulse down a rope that’s attached to Snoopy’s dog house. The rope itself is not transported, but the pulse and its energy are! pulse

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Types of Waves A mechanical wave is just a disturbance that propagate through a medium. The medium could be air, water, a spring, the Earth, or even people. A medium is any material through which a wave travels. Mechanical wave examples: sound; water waves; a pulse traveling on a spring; earthquakes; a “people wave” in a football stadium. An electromagnetic wave is simply light of a visible or invisible wavelength. Oscillating intertwined electric and magnetic fields comprise light. Light can travel without medium—super, duper fast. A matter wave is a term used to describe particles like electrons that display wavelike properties. It is an important concept in quantum mechanics. A gravity wave is a ripple in the “fabric of spacetime” itself. They are predicted by Einstein’s theroy of relativity, but they’re very difficult to detect.
Mechanical Waves:  Three Types Mechanical waves require a physical medium. The particles in the medium can move in two different ways: either perpendicual or parallel to direction of the wave itself. In a longitudinal wave, the particles in the medium move parallel to the direction of the wave. In a transverse wave, the particles in the medium move perpen- dicular to the direction of the wave. A

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## This note was uploaded on 11/17/2011 for the course PHYS 121 taught by Professor Burgeson during the Fall '11 term at BYU.

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waves - TopicList TypesofWaves Wavespeed LongitudinalWaves...

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