-Definition of wave:-
It is a disturbance which travels through the medium due to repeated periodic motion of particles of the medium about their equilibrium position.
-Example of wave motion are sound waves traveling through an intervening mediun, water waves, light waves and many more such examples are there.
-Waves requiring material medium for their propagation are called MECHANICAL WAVES. Mechanical waves are governed by Newton's law of motion.
-Sound waves are mechanical waves in atmosphere between source and the listner and require medium for their propagation.
-Other examples of mechanical waves are sesmic waves and water waves.
-Those waves which does not require material medium for their propagation are called NON MECHANICAL WAVES.
-One familiar example of NON MECHANICAL WAVES is waves associated with light or light waves. Another such examples are radio waves, X-rays, micro waves, UV light, visible light and many more.
-Transverse waves are such waves where the displacements or oscillations are perpandicular to the direction of propagation of wave.
-Longitudinal waves are those waves in which displacement or oscillations in medium are parallel to the direction of propagation of wave for example sound waves.
-At any time t , displacement y of the particle from it's equilibrium position as a function of the coordinate x of the particle is
A is the amplitude of the wave
k is the wave number
ω is angular frequency of the wave
and (ωt-kx) is the phase.
-Wavelength λ and wave number k are related by the relation
-Time period T and frequency f of the wave are related to ω by
ω/2π = f = 1/T
-speed of the wave is given by
v = ω/k = λ/T = λf
-Speed of a transverse wave on a stretched string depends on tension and the linear mass density of the string not on frequency of the wave
T=Tension in the string
μ=Linear mass density of the string
-Sounds waves are longitudinal mechanical waves that can travel through solids,liquid and gases
-Speed of longitudinal waves in a medium is given by
ρ=Density of the medium
-Speed of longitudinal waves in ideal gas is
P=Pressure of the gas
ρ=Density of the gas
Principle of superposition:
When two or more waves traverse thrugh the same medium,the displacement of any particle of the medium is the sum of the displacement that the individual waves would give it.
Class 9 physics notes on chapter motion is now available at the following link CLASS 9 MOTION NOTES (FULL LENGTH)
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