If an airplane is traveling towards you, its frequency appears?

Aphysical change is a change in the size, shape,, or stafe of matter true or false

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?

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?