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# STATIONARY WAVES

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Studyy of stationary waves

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### STATIONARY WAVES

1. 1. STATIONARY (STANDING) WAVES
2. 2. When two waves of same frequency moving in opposite directions Superimpose we have stationary waves.
3. 3. when the two waves are 180° out-of-phase with each other they cancel
4. 5. when the the two waves are in-phase with each other they add together
5. 9. COMPARISON OF STANDING WAVE WITH (PLANE) PROGRESSIVE WAVE
6. 10. Appears to travel from one point to another. Consists of one wave moving in one direction. There is flow of energy. Consists of crests and troughs. Change in pressure and density is uniform. Appears to be stationary. Combination of two progressive waves moving in opposite directions. No transfer of energy takes place. Consists of nodes and antinodes. Change in pressure and density is not uniform. 1 2 3 4 5 Plane progressive wave Standing wave S.No.
7. 11. NUMERICAL
8. 12. Stationary waves are produced by the superposition of following waves Y 1 = 0.05Sin(5 π t- x) Y 2 =0.05Sin(5 π t+ x) Where x and y are in metres and t in secs. Find the displacement of a Particle Situated at a distance of x=1 m.
9. 13. SOLUTION
10. 14. Y= Y 1 + Y 2 =0.05Sin(5 π t- x) + 0.05Sin(5 π t+ x) =0.1CosxSin5 π t Now, Amplitude =0.1Cosx Or, Displacement= 0.1Cos1 (as x=1) =0.1Cos(180 ° / π ) =0.1Cos57.3 ° =0.054 m.
11. 15. Thanks. LORD JESUS, the CREATOR of the universe bless you!