3. Match the following correctly: Column A Column B ​

An observation that requires measurement is called quantitative observable or qualitative

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

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?