This book is intended as a general introduction to modern physics for science and engineering students. It is written at a level which presurnes a prior tull year’s course in classical physics, and a knowledge of elementary differential and integral calculus. The material discussed here includes probability, relativity, quantum mechanics, atomic physics, statistical mechanics, nuclear physics and elementary particles.Unifying concepts which halve important applications throughout modern physics, such as relativity, probability and the laws of conservation, have been stressed. Almost all theoretical developments are linked to examples and data taken from experiment. Summaries are included at the end of each chapter, as well as problems with wide variations in difficulty.