A LASER BEAM AIMED AT THE MOON TAKES 2.56 SECONDS TO RETURN AFTER REFLECTION AT MOON'S SURFACE.FIND THE RADIUS OF LUNAR ORBIT AROUND EARTH.
Asked by Karishma Sayyad | 9th May, 2014, 04:16: AM
Let 'x' be the distance between the earth's surface and moon's surface.
Then the total distance travelled by the laser beam from earths surface to moon's surface and then after reflection back to earth will be '2x'
Given the time taken by the laser beam to return after reflection at moon's surface is 2.56 seconds.
i e t = 2.56 sec
Laser beam being an electromagnetic wave, travels with the speed of light ,s = 3×108 m/s
Therefore the total distance travelled by the beam = speed of the beam × total time taken by the beam
2 x = 3×108 m/s × 2.56 seconds.
= 7.68 × 108 m
x = 3.84 × 108 m.
Thus we can say that the radius of the lunar orbit around earth is 3.84 × 108 m
Answered by Jyothi Nair | 9th May, 2014, 09:13: AM
- The focal length f of a mirror is given by 1/f=1/u+1/v where u and v represent object and image distances respectively. Find relative error in calculation of focal length if u & v are (100 ± 3)cm and (200 ± 4)cm respectively
- log (1.759÷0.236)
- f r of a wire is increased by 50 and potential difference decreased by 50% then find the percentage change in current
- define error
- The percentage errors in the measurement of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of kinetic energy obtained by measuring mass and speed?
- give classification of unit with example
- the error in the measurement of the side of a rectangle is 1% the error in the measurement of its area is
- star A is farther than star B. which star will have a large parallax angle
- How can we estimate the error in the combination of quanties
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Verify mobile number
Enter the OTP sent to your number