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215-Superpostion, Longitudinal Waves - particles oscillate in the plane parallel to the wave motion Eg : sound waves, wave motion in coil spring can be classfied as Progressive Waves - are waveforms that move - energy is transferred due to a progressive wave Intensity is defined as the power per unit area. I=P/Sarea Therefore, power of a wave is defined as the rate at which energy is transmitted by the wave. P=Energy/t -----> I=Energy/Sarea.t since E α A^2 Intensity α Amplitude^2, Types of Waves ???? Transverse Waves - particles oscillate in the directionb perpendicular to the wave motion - can be polarised Eg : Electromagnetic Waves What about EM waves? - do not need a medium for propagation - travel in vacuum at 3x10^8 m/s - are transverse waves of disturbances in electric and magnetic field, Superposition ???? Types of Waves, Types of Waves ???? What is a wave? - waves motion refers to the propagation of disturbances from one region to another - it transmit energy from the source to another point Eg: waves in ripple tanks, stretched rope Terms in Waves - displacement : distance of the particle from its equilibrium position - amplituse : maximum magnitude of the displacement - period : time taken for particle to complete one cycle - frequency : no. of oscillations per unit time f=1/T - wavelength : distance between two consecutive particle of the same phase - speed : distance moved by wavefront in one seconds - phase difference : difference in the stages of oscillation in a cycle ϕ/2π=x/λ, Types of Waves ???? Longitudinal Waves - particles oscillate in the plane parallel to the wave motion Eg : sound waves, wave motion in coil spring, Transverse Waves - particles oscillate in the directionb perpendicular to the wave motion - can be polarised Eg : Electromagnetic Waves What about EM waves? - do not need a medium for propagation - travel in vacuum at 3x10^8 m/s - are transverse waves of disturbances in electric and magnetic field can be classfied as Progressive Waves - are waveforms that move - energy is transferred due to a progressive wave Intensity is defined as the power per unit area. I=P/Sarea Therefore, power of a wave is defined as the rate at which energy is transmitted by the wave. P=Energy/t -----> I=Energy/Sarea.t since E α A^2 Intensity α Amplitude^2