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Oscillations

# A wave is reflected from a rigid support . The change of phase on reflection will be

$(a)\;0\qquad(b)\;\large\frac{\lambda}{4}\qquad(c)\;\large\frac{\lambda}{2}\qquad(d)\;\lambda$

Answer : (d) $\;\lambda$
Explanation :
At the rigid end , the wave form gets inverted
Therefore , the phase change is $\;\lambda\;.$