1.

A spherical source of power 4 W and frequency 800 Hz is emitting sound waves. The intensity of waves at a distance 200 m is   [CPMT 1999; JIPMER 2000]

A.            \[8\times {{10}^{-6}}\,W/{{m}^{2}}\]                            
B.            \[2\times {{10}^{-4}}\,W/{{m}^{2}}\]
C.            \[1\times {{10}^{-4}}\,W/{{m}^{2}}\]                            
D.            \[4\,W/{{m}^{2}}\]
Answer» B.            \[2\times {{10}^{-4}}\,W/{{m}^{2}}\]


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