A wave travelling on a stretched string is given by

PHYSICS · Single correct · CBSE · Physics · Waves · Waves

Problem

A wave travelling on a stretched string is given by y=0.02cos⁡(0.8x−40t+π6)y = 0.02\cos(0.8x - 40t + \dfrac{\pi}{6}). Its speed of propagation is (a) 40 m s−140\,\text{m\,s}^{-1} (b) 32 m s−132\,\text{m\,s}^{-1} (c) 50 m s−150\,\text{m\,s}^{-1} (d) 25 m s−125\,\text{m\,s}^{-1}

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