An argon ion laser emits light of wavelength of 488 nm. (a) calculate the frequency of the light. (b) suppose a pulse of light from this laser is sent from earth, is reflected from a mirror on the moon, and returns to its starting point. calculate the time elapsed for the round trip, taking the distance from earth to the moon to be 3.8×10^5 km.

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

How many grams of iron can be made from 16.5 grams of fe2o3

Astudent made the lewis dot diagram of a compound as shown. mg is written with two dots shown on its top. an o is written on each side of mg. each o has six dots around it. an arrow is shown from one dot on mg toward the vacant space around the o on the right. another arrow is shown from the other dot on mg toward the vacant space around the o on the left. the title of the art is students lewis dot model. what is the error in the lewis dot diagram? an o atom should transfer all its six electrons to mg because the formula is mgo. both electrons of mg should be transferred to one o atom because the formula is mgo. the electrons should be transferred from each o atom to mg because mg has fewer electrons. the number of dots around mg should be four because it has to transfer two electrons to each o.