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, 22.06.2019 10:00
Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?
Answers: 1
Physics, 22.06.2019 15:30
The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.
Answers: 1
Explain what it means when we say a substance is magnetic...
English, 01.03.2021 14:30
Mathematics, 01.03.2021 14:30
History, 01.03.2021 14:40
Mathematics, 01.03.2021 14:40
Mathematics, 01.03.2021 14:40
Mathematics, 01.03.2021 14:40
Mathematics, 01.03.2021 14:40
Mathematics, 01.03.2021 14:40
Health, 01.03.2021 14:40
Social Studies, 01.03.2021 14:40
Social Studies, 01.03.2021 14:40
Social Studies, 01.03.2021 14:40