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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
Figure given below shows four progressive waves $A, B, C$ and $D$ with their phases expressed with respect to the wave $A$ . It can be calculated from the figure that
  • A
    the wave $C$ is ahead by a phase angle of $\pi /2$ and the wave $B$ lags behind by a phase angle of $\pi /2$
  • ✓
    the wave $C$ lags behind by a phase angle of $\pi /2$ and the wave $B$ ahead by a phase angle of $\pi /2$
  • C
    the wave $C$ is ahead by a phase angle of $\pi $ and the wave $B$ lags behind by a phase angle of $\pi $
  • D
    the wave $C$ lags behind by a phase angle of $\pi $ and the wave $B$ is ahead by a phase angle of $\pi $
✓

Answer

Correct option: B.
the wave $C$ lags behind by a phase angle of $\pi /2$ and the wave $B$ ahead by a phase angle of $\pi /2$
b
It is clear from figure that the wave $A$ attains its mean position $T/4\,times$ earlier than $C$ , i.e., $C$ lags behind $A$ by phase angle $\pi /2$ . Further, $B$ attains the mean position $T/4\,times$ earlier than $A$ , i.e., $B$ is ahead by a phase angle of $\pi /2$

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