Physics

Perfect black body

Perfect black body is one which absorbs heat radiation of all wavelengths, which falls on it. Such a body neither reflects nor transmits any part of the incident heat radiation and hence appears black irrespective of the color of incident radiation. Obviously, the absorbance of a perfect black body. A perfect black body when heated …

fire cracker exploding

Fire cracker exploding at rest- Consider the explosion of a fire cracker at rest into number of fragments. The explosion takes place not because of any external force but due to chemical reactions occurring in the cracker. Through the fragments fly off in different directions with different velocities of the center of mass remains zero …