Physics Past Questions and Answers

Which of the following statements is not a reason for using soft iron in making the core of a transformer? It

Beta particles are faster-moving

A process by which two light atoms join to form a new atom of higher atomic mass is

Light of energy 5.0 eV falls on a metal of work function 3.0 eV and electrons are emitted, determine the stopping potential. [electronic charge, e = 1.60 x 10⁸ms^-19]

The mass of a proton is 1.0089\(\mu\) and that of a neutron is 1.0089\(\mu\). Determine the energy evolved in stabilizing the nucleus of nitrogen of mass number 14 with 7 protons and 7 neutrons. [speed of light = 3.0 x 10⁸ms^-1; 1\(\mu\) = 1.67 x 10^-27kg]