How does the force of gravity between two bodies change when the distance between them doubles? 1. unable to determine; the mass is needed. 2. doubles 3. halves 4. quadruples 5. remains the same 6. drops to one quarter of its original value?

Acube has a volume of 2011 cubic inches. what is the angle measure between a side of a cube and its interior diagonal?

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

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?