A bullet of mass 10g moving with a velocity 400m/s gets embedded in a freely suspended wooden block of mass 900g. what is the velocity acquired by the block.

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?

Both independent and dependent clauses

Debris produced by mining is called