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A spherical source of power \( 4 \mathrm{~W} \) and frequency \( 800 \mathrm{~Hz} \) is emitting sound waves. The intensity of waves at a distance \( 200 m \) is
[CPMT 1999; JIPMER 2000]
(a) \( 8 \times 10^{-6} \mathrm{~W} / \mathrm{m}^{2} \)
(b) \( 2 \times 10^{-4} \mathrm{~W} / \mathrm{m}^{2} \)
\( \mathrm{P} \)
W
(c) \( 1 \times 10^{-4} \mathrm{~W} / \mathrm{m}^{2} \)
(d) \( 4 \mathrm{~W} / \mathrm{m}^{2} \)
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