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 ____________

The displacement of particles in a string stretched in the x-direction

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.	coskxsin t
B.	k<sup>2</sup> <sup>2</sup>- <sup>2</sup> t<sup>2</sup>
C.	cos<sup>2</sup> (kx+ t)
D.	cos<sup>2</sup> (k<sup>2</sup> x<sup>2</sup>- <sup>2</sup> t<sup>2</sup>)
Answer» B. k<sup>2</sup> <sup>2</sup>- <sup>2</sup> t<sup>2</sup>

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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 ____________

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