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When the body is at position C, its height above the ground may be regarded as zero. Therefore, potential energy of the body = 0. If v c is the velocity with which the body touches the ground, then v c 2 - 0 = 2gh v c 2 = 2gh Total energy of the bo..

Capacitors and inductors are capable of storing energy in the electric field and magnetic field respectively. No A.C elements i.e., capacitor, inductor are pure. In other words each of them do have some resistance. The charges or current through these elements lose their energy as heat du..

Center of curvature (C) is the center of the sphere of which the spherical mirror forms a par..

Here we consider a ray of light which is parallel to the principal axis and another ray passing through the focus. The ray which is parallel to the principal axis passes through the principal focus and the ray which passes through the focus after reflection emerges parallel to the principal axis. T..

Object at 2F or C..

It is a point lying on the principal axis of the lens so that a ray of light whose refracted path passes through this point will have its emergent path parallel to the direction of the incident ra..

This means that a is negative. The resistivity of an insulator too decreases exponentially with increase in temperature. These observations may be understood qualitatively using the equation for r . Since m and e are constants, In metals, the number of free electrons, n does not change with..

14X + 6X = 240 - 120 20X = 120 The knife edge should be provided at 56 cm mark. Example 2 : A see-saw of 4m is provided with a wedge at the center. Susan and Jason of weights 500 N and 300 N respectively are sitting on the same side of the fulcrum at 2 m and 1.5 m from center respectively. If Karl ..

The critical frequency (f c ) for a given layer is the highest frequency that will be returned down to Earth by that layer after having been beamed straight up at it. It is important to realise that there is such a maximum, and it is also necessary to know its value under a given set of ..

(i) b - rays consist of negatively charged particles and have the same mass as that of an electron. (ii) Since their velocities are 1/10 t h of the speed of light they are considered as fast moving electrons. (iii) The penetrating power of b -particles is larger than that of a - particles. ..