At , a compression of a sound wave is at . At , the same compression is observed at .…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

t = 0

, a compression of a sound wave is at

x = 0.60\,\text{m}

. At

t = 2.0\,\text{ms}

, the same compression is observed at

x = 0.90\,\text{m}

. The wavelength obtained from the displacement–position graph is

0.30\,\text{m}

. Determine the speed and direction of propagation of the wave. (a)

75\,\text{m\,s}^{-1}

toward

+x

−direction (b)

300\,\text{m\,s}^{-1}

toward

+x

−direction (c)

150\,\text{m\,s}^{-1}

toward

+x

−direction (d)

150\,\text{m\,s}^{-1}

toward

-x

−direction