What is the energy of a microwave photon that has a frequency of 9.86 x 1012 Hz?

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

How many moles of oxygen react with 12 moles of aluminum

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?