Post on 12-Apr-2017
transcript
LONGITUDINAL WAVES• Longitudinal waves are the waves when its
propagates in the medium, the particles of the medium will vibrates parallel to the direction of the wave.
• Example : • Sound waves• Tsunami waves• Earth quake waves• Wave produced in Slinky
Characteristics of Longitudinal waves
Longitudinal waves travel through a fluid by creating regions
of COMPRESSION and RAREFACTION of the fluid, which travel in the
direction of the wave.
The WAVELENGTH, λ, is the distance between the centers of two
consecutive zones of compression or rarefaction, as shown in the
above diagram. A particle, P, of the fluid will oscillate in a range 2A,
where A is the amplitude of the wave.
COMPRESSION & RAREFACTION• Compression :• Where the particles of
the medium are close together by increased pressure.
• Rarefaction :• Where the particles are
far each other due to low pressure.
Sound waves are longitudinal waves. A tuning fork is used for doing experiments in in sound. This figure shows how a vibrating tuning fork creates Lon--tudinal wavesIn the air. Air pressure isgreater where theAir particles crow--ded together andthe air particle is free where the airPressure is low.
MEASURING WAVES
• The important measurements related to a wave are given below.
• Amplitude - a – maximum displacement of a particle from mean position• Wave length - λ – distance between any two consecutive points.• Wave velocity - v – the distance that a wave travels in one second.• Frequency - f -- number of a waves per seconds. Unit is herts(Hz)