What is the product when the wavelength of any electromagnetic radiation is multiplied by the frequency?

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule