Question
Given below are some functions of x and t to represent the displacement of an elastic wave.
$\text{y}=5\cos(4\times)\sin(20\text{t})$
$\text{y}=5\cos(4\times)\sin(20\text{t})$
✓
Answer
A travelling wave along (-x) direction must have $+\text{kx}\ \text{i}.\text{e}.,$ in $(\text{iv})\text{y}=100\cos(100\pi\text{t}+0.5)$ so (a) (iv).
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