A strip of copper and another of germanium are cooled from room temperature to $$80K.$$ The resistance of

Which of the following radiations has the least wavelength ?

When a $${U^{238}}$$ nucleus originally at rest, decays by emitting an alpha particle having a speed $$'u',$$ the recoil speed of the residual nucleus is

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the