The time taken by a data signal to reach a moon and then back to earth was about:
Correct answer: C. 2 seconds
- A. 1 second
- B. 1 minute
- C. 2 seconds
- D. 1 hour
Explanation
The average distance between the Earth and the Moon is approximately 384,400 kilometers. Radio waves, which are commonly used for communication with spacecraft, travel at the speed of light, which is about 299,792,458 meters per second.To calculate the one-way travel time from Earth to the Moon, we can divide the distance by the speed:Travel time (one way) = Distance / SpeedTravel time (one way) = 384,400,000 meters / 299,792,458 meters/second ≈ 1.28 secondsFor the round trip (to the Moon and back), we simply multiply the one-way travel time by 2:Round trip travel time ≈ 1.28 seconds/trip * 2 trips ≈ 2.56 secondsSince the question asks for an approximate value, and considering that the actual distance to the Moon can vary slightly depending on its orbit, 2 seconds is a reasonable estimate for the round trip travel time.
Last updated
About Networking and Internet
Networking covers LAN, MAN, WAN and wireless networks, network topologies, transmission media, devices such as switches, routers and modems, and the OSI and TCP/IP models. Internet concepts include IP addresses, DNS, URLs, web browsers, email, protocols such as HTTP, HTTPS, FTP and SMTP, and basic network security.
Practise Networking and Internet
452 free Networking and Internet MCQs from Computer Science and IT, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Computer Science and IT questions like this
Computer Science and IT is on 40 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.