Suppose an upward force of 15N is added to the box. what will be net vertical force on the box

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?

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions