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).

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.