What is the energy of a photon whose frequency is 1.89 x 10^15 Hz

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

What are the major types of a chemical compound