Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  AIMS  >>  Class11  >>  Physics  >>  Units and Measurement
0 votes

A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon's surface. How much is the radius of the lunar orbit around the Earth?

$\begin {array} {1 1} (A)\;3.84 \times 10^5 km & \quad (B)\;38.4 \times 10^5 km \\ (C)\;3.84 \times 10^9 km & \quad (D)\;38.4 \times 10^9 km \end {array}$

Can you answer this question?

1 Answer

0 votes
Ans : (A)
$3.84 \times 10^5 km $
answered May 28, 2014 by thanvigandhi_1
Ask Question
student study plans
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App