The half life of a radioactive substance is T. The time taken, for disintegrating $$\frac{7}{8}$$th part of its original mass will be:

In a metallic conductor, under the effect of applied electric field, the free electrons of the conductor

A gas mixture consists of 2 moles of oxygen and 4 moles of neon at temperature T. Neglecting all vibrational modes, the total internal energy of the system will be,

A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will