Anucleus in a transition from an excited state emits a gamma-ray photon with an energy of 2.5 mev. (a)
what is the photon frequency? (b) what is the photon wavelength? (c) how does the wavelength compare
with typical nuclear radii (of the order 10−15 m)?

Apositive rod is placed to the left of sphere a, and the spheres are separated. which best describes the spheres? sphere a is negative and sphere b is positive because protons from sphere a are attracted to the rod and move to sphere b. sphere a is negative and sphere b is positive because electrons from sphere b are attracted to the rod and move to sphere a. sphere a is positive and sphere b is negative because electrons from the rod move to sphere b and protons then move to sphere a. sphere a is positive and sphere b is negative because protons move from sphere b to the rod and also to sphere a.

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection