What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?
In a pure semiconductor, the number of electrons in the conduction band is
In a thermonuclear reaction, the total initial mass is 5.02 x \(10^{-{2}{7}}\)kg and the total final mass is 5.01 x \(10^{-{2}{7}}\)kg. The energy released in the process is
[c = 3.0 x \(10^8\) ms-1]
