A sine wave of wavelength $\lambda $ is travelling in a medium. The minimum distance between the two particles, always having same speed, is
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In a sine wave particles that are separated by a distance of odd multiple of half the wave length move with same speed and but in opposite direction. The minimum separation is $\frac{\lambda}{2}$
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The figure represents the instantaneous picture of a transverse harmonic wave traveling along the negative $x$-axis. Choose the correct alternative $(s)$ related to the movement of the nine points shown in the figure. The points moving downwards is/are
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