What is one common way that a charge can accumulate on an object? . a. through friction b. through gravitation c. through nuclear force d. through centrifugal force

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?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Which of these are physical changes in matter? check all that apply. boiling water a pencil being sharpened exploding dynamite freezing water rotting cheese