Ahe-ne laser emits radiation with second by =633nm. how many photons are emitted per wavelength a laser with a power of 1 mw?

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.