What does a control group show in an experimental investigation? A. the effects that the scientists are causing by manipulating variable? B.
how nature would act without manipulation by the researchers ? C.
why each part of a system is related to every other part ? D.
all parts of a system that scientists are controlling and changing

Decreased sensitivity to an unchanging stimulus is known as

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?

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?