Answer: (i) army : Echoes can be used by armed forces to acquire the new firearm position out-of adversary
Answer: (i) army : Echoes can be used by armed forces to acquire the new firearm position out-of adversary If the speed of sound is 334 ms-step one, assess time in that he hears an echo army, geologists, anglers. Answer: t = 0 Radar a device can be used to obtain a challenger air-craft motorboat.…