1.

The displacement of particles in a string stretched in the x-direction is represented by y. Among the following expressions for y, those describing wave motion are

A. coskxsinωt
B. k<sup>2</sup> ω<sup>2</sup>-ω<sup>2</sup> t<sup>2</sup>
C. cos<sup>2</sup> (kx+ωt)
D. cos<sup>2</sup> (k<sup>2</sup> x<sup>2</sup>-ω<sup>2</sup> t<sup>2</sup>)
Answer» B. k<sup>2</sup> ‚âà√¨‚àö¬¢<sup>2</sup>-‚âà√¨‚àö¬¢<sup>2</sup> t<sup>2</sup>


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