If the resistance of R1, R2, and R3 are 1 ohm, 2 ohm, and 3 ohms and the total voltage is 9 volts, what is the total current

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?

What is the measure of a change in an objects velocity?

Which type of basaltic lava flow has a fairly smooth