Question 2 ( A spherical power source of (5.62x10^2) milliwatts is (6.80x10^0) metres from a detector of area (1.5x10^0) cm2. If the signal is on the detector for (8.02x10^0) seconds, find the energy at the detector, in millijoules, to 2 sf.An observer in a car moving at (1.0000x10^1) m/s is receding from a stationary sound source which is sounding a (6.90x10^2) Hz note. If the speed of sound is (3.170x10^2) m/s, what frequency in Hz does the observer in the car hear? Use 3 sf in your answer. Vo