As a motorcycle moves away from you, what happens to the amplitude and frequency of the sound it produces? -Both the amplitude and the frequency increases

-Both the amplitude and frequency decreases

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?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

Name two kinds of practical electric pumps.