Which phenomenon does a hologram use to create an image?
A ray of light is incident on a transparent medium at an angle of 60°. The reflected ray of light is found to be completely Q.4 polarized. Then, the r...
Which of the following is not a nuclear reaction?
What is the escape velocity from Earth? Â
The surface tension of water on adding detergent to it –
What is the principle behind the working of a transformer? Â
 The radii of curvature of the faces of a double convex lens are 20 cm and 30 cm. If focal length of the lens is 36 cm find the refractive index of t...
What is the main effect of increasing the temperature of a gas at constant volume? Â
What is the speed of sound in air at room temperature (20°C)? Â
A toroid has a core (non-ferromagnetic) of inner radius 23 cm and outer radius 28 cm, around which 4000 turns of a wire are wound. If the current in th...