Waves
A plucked string sings, ripples cross a pond, and sound reaches across a hall. Chapter 14, Waves, of the NCERT Physics textbook for Class 11 follows the disturbance. You will distinguish transverse and longitudinal waves, relate speed, frequency and wavelength, and study travelling waves with displacement relations. The superposition principle yields standing waves in strings and pipes with harmonics, and beats with the Doppler effect explain what is heard when sources and listeners move.
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