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 18:30
Which property of fossils allow scientists to determine the relative rock ages..
Answers: 1
Physics, 22.06.2019 13:00
The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot
Answers: 1
Physics, 22.06.2019 18:30
Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?
Answers: 1
Explain why the helium gas inside this balloon exerts pressure on the balloon....
Biology, 01.08.2019 16:30
History, 01.08.2019 16:30
Chemistry, 01.08.2019 16:30
Business, 01.08.2019 16:30
History, 01.08.2019 16:30
English, 01.08.2019 16:30
English, 01.08.2019 16:30
Biology, 01.08.2019 16:30
Mathematics, 01.08.2019 16:30
Physics, 01.08.2019 16:30