What is the most accurate sight for a firearm?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.

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?