A) y = \[\alpha \]sin \[\omega \]t
B) y = \[\alpha \] sin (\[\omega \]t - kr)
C) y = \[\frac{a}{\sqrt{r}}\]sin(\[\omega \]t - kr)
D) y = \[\frac{a}{r}\] sin(\[\omega \]t - fr)
E) None of the above
Correct Answer: D
Solution :
The amplitude of a plane progress wave = a that of a spherical progressive wave is\[\frac{a}{r}\].
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