Answers: 1
Physics, 21.06.2019 18:10
Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.
Answers: 1
Physics, 21.06.2019 23:30
Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane
Answers: 2
Physics, 22.06.2019 11:10
Which situation will produce the greatest change of momentum
Answers: 2
Physics, 23.06.2019 00:30
Why is no-till farming more sustainable than many traditional methods of farming
Answers: 3
Ravens eat meat but they don’t kill it themselves. what kind of animal does this make them?...
Mathematics, 23.04.2020 23:42
Physics, 23.04.2020 23:42
Physics, 23.04.2020 23:42
Social Studies, 23.04.2020 23:42
Geography, 23.04.2020 23:43
Computers and Technology, 23.04.2020 23:43
Mathematics, 23.04.2020 23:43
English, 23.04.2020 23:43
Computers and Technology, 23.04.2020 23:44