A coil in a magnetic field encloses a flux of 0.196 T·m2 when the angle between the normal to the coil and the direction of the magnetic field is 62.0°. What flux would go through the coil if the angle were changed to 38.9°?
a. 0.118 T·m2
b. 0.123 T·m2
c. 0.539 T·m2
d. 0.325 T·m2
e. 0.139 T·m2
d
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A microphone in the ocean is sensitive to the sounds emitted by porpoises. To produce a usable signal, sound waves striking the microphone must have an intensity of 1.02 × 10^?11 W/m2 . If porpoises emit sounds with a power of 0.049 9 W, how far away can a porpoise be and still be heard? Disregard absorption of sound waves by the water
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