How are the isotopes of an element different from one another ?

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at

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?

What are some natural measures of time