Most of the stars in the Milky Way will end their lives as

a white dwarfs
b. black holes
C. supernovas,
d. red giants

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?

Ineed the answers for these promblems i have

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?