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 …

What is logarithm? The term logarithm is basically derived from two words, “logas” and “arithmos”. Logas implies ratio while arithmos means number. The logarithm of any number to a given base is the power to which the base must be raised to obtain that number. Foe example, we know that 2 raised to power 5 …

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 …

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To find the coordinates of the point which divides in a given ratio (m1 : m2) the line joining two given points (x1, y1) and (x2, y2). Let P1 be the point (x1, y1) , P2 be the point (x2, y2) and P be the required point, so that we have P1P: PP2 :: m1 …