is transporting the reulting sediment away

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

The air that we breath is made mostly of which gaseous molecule

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2