I don't get this question could someone help out If Rock A can scratch rock B, I can say with confidence that

Question 6 options:

Rock A is the same as Rock B

Rock A is harder than Rock B

Rock B is harder than Rock A

Rock B displays fracture

What is the relationship between the wavelength of a wave and it's energy?

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?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is