During nuclear fission, great amounts of energy are produced from a. particle accelerators b. tremendous amounts of mass c. a series of chemical reactions d. very small amounts of mass (there are already two questions about this with 3 different answers, so that's why i'm asking this)

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

When using the scientist method, which step comes last?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?