Final answer:
Radar determines Venus's distance by measuring the echo time, which in this case is 1000 s. The distance to Venus can be calculated using the speed of light and the round-trip time of the radar signal, resulting in a distance of 150 million km.
Step-by-step explanation:
Radar measures the distance to Venus by measuring the round-trip time for an echo from Venus. Radar determines Venus's distance by measuring the echo time, which in this case is 1000 s. The distance to Venus can be calculated using the speed of light and the round-trip time of the radar signal, resulting in a distance of 150 million km. The echo time in this case is given as 1000 s.
To find the distance, we can use the fact that the speed of light is approximately 3.00 x 10^8 m/s. Since the radar signal travels to Venus and back, the distance to Venus is half of the total distance traveled by the signal. Therefore, the distance to Venus is (1000 s) x (3.00 x 10^8 m/s) / 2 = 1.50 x 10^11 m = ">150 million km