Một tia laser được phát ra từ nguyên tử nitơ có bước sóng 337 nm và có tổng năng lượng là 3,87 mJ. A) Tia laser trên thuộc vùng quang phổ nào của dãy quang phổ điện từ?

B)Tia laser đó chứa bao nhiêu photon?

Biết: vận tốc ánh sáng C = 3,0.108 (ms-1); hằng số Planck h = 6,626.10-34 (Js).

Answer it was we, the the whole people, who formed the union. and we formed it, not to give the blessings of liberty, but to secure them: not to the half of ourselves and the half of our posterity, but to the whole people- women as well as men.

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.

Hello! mitosis and meiosis are the same, because they are both ways of dividing cells and reproducing cells. they are different in many ways, but the main one is that meiosis splits the number of chromosomes in 1/2, while the number of chromosomes remains the same for mitosis. plus, meiosis has two stage of division, unlike mitosis, where it has only one.