Udit Gupta is teaching live on Unacademy Plus
Udit Gupta Ex-VMC Physics Faculty
WELCOME TO THE 1ST LESSON IN WAVES. The sub-topics include: vibrations in a stretched string. Visit: unacademy.com/plus to register for SPECIAL CLASSES. Definition, mechanical waves, transverse waves, longitudinal waves &X
DEFINITION Wave is defined as a disturbance which propagates energy and momentum from one place to the other without the transport of matter. Sound waves in form of thunder Light Waves
| MECHANICAL WAVE (MEDIUM NECESSARY) Method of energy propagation, in which disturbance propagates with definite velocity without changing its form, is called mechanical wave. Energy and momentum propagate by motion of particles of medium. But medium remains at previous position, mass transfer does not take place. Propagation is possible due to property of medium viz. elasticity and inertia. Mechanical waves maybe of two types:
TRANSVERSE WAVES The particles of medium vibrate in a direction perpendicular to the direction of propagation of wave. Eg. Vibration of string, the surface waves produced on the surface of solid and liquid. Crest and trough are formed.
LONGITUDINAL WAVES Vibration of the particles of the medium are in the direction of wave propagation. Eg. Sound waves, waves in gases. Wave proceeds in form of compression (C) and rarefaction (R). At places of compression the pressure and density are maximum, while at places of rarefaction those are minimum. R C R
VIBRATION IN A STRETCHED STRING Transverse stationary waves are formed on a stretched string fixed at both ends. Speed of waves in a stretched string is given by: u = |-, where T is the tension of the string, is the mass per unit length of the string. Laws of vibrating stretched string: The fundamental frequency of a stretched string is given by v - 1 T 1 T 2LE =
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