Which of the following parts of a sound wave corresponds to a trough in a transverse wave? a. equilibrium b. compression c. rarefaction d. peak

Iwill give brainliest if you answer right : )

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?

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87