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PAPER: EDU 10TECHNO PEDAGOGIC CONTENT

KNOWLEDGE ANALYSIS

SUBMITTED BY CHITRA.N PHYSICAL SCIENCE 18214383008

SUBMITED TO LINIMOL .K.S LECTURER PHYSICAL SCIENCE SNTC, SREEKANDESWARAM POOCHACKAL

STD. : IX UNIT : WAVE MOTION TOPIC : Longitudinal waves

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

LONGITUDINALWAVES 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)

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