What would the frequency be of a photon beam that had 4.72 x 10^8 joules of energy. Planck's constant is 6.6262 x 10^-34 joule* seconds

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

Which compound contain an iron with a 3+ charge

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive