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A traveling wave on stretched string can be understood by the function y = f(x -vt). Here v is the wave speed ‘x’ is co-ordinate of point and ‘y’ is its instantaneous displacement. To describe the wave completely, we must specify the function f. If the wave moves in negative x-direction y (x, t) = f(x + vt) and if it moves in positive x-direction y (x, t) = f(x - vt). The general relation for a traveling wave must satisfy the relation 
, if plane wave exists. The particle velocity and wave velocity are related by Vpa = - (slope) (wave velocity ). Answer the following questionsConsider the snapshot of a wave traveling in positive x-direction
- The particle A is moving in -ve y-direction and particle B is moving in +y-direction
- The particle B is moving in -ve y-direction and particle A is moving in +y-direction
- Both are moving in the +ve y-direction
- Both are moving in -ve y-direction
The correct answer is: The particle A is moving in -ve y-direction and particle B is moving in +y-direction
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Physics-General
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Two coherent sources S1 and S2 at a distance interference effect at point P,O is the middle point of S1S2 and origin of the coordinate system, as shown, such that 
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Two coherent sources S1 and S2 at a distance interference effect at point P,O is the middle point of S1S2 and origin of the coordinate system, as shown, such that Find the coordinate of source S1 when sources are rotated about point O so that no interference effect is observed at P:
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The figure shows the location of a source and detector at time t = 0. the source and detector are moving with velocities 
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A compound microscope has an objective lens of 1 cm and eyepiece of 2.5 cm focal length. When the object is placed at 1.1 cm from the objective, the final image is at the least distance of distant vision, the magnification produced and length of microscope is (nearly)
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