2. An alternating current is represented by the equation I=20sin 100mt. Compute its frequency and the maximum r. m.s values of current.
Ans: 50Hz,20A,14.14A

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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?