Physics
(a) Name the waves used for echo depth sounding.
(b) Give one reason for their use in the above application
Related Questions
(a) Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen?
(b) A glass lens always forms a virtual, erect and diminished image of an object kept in front of it. Identify the lens.
Two copper wires A and B are of the same thickness and are at the room temperature. If the length of A is twice the length of B then :
(a) Compare their resistances
(b) Compare their resistivity
It is observed that the house circuits are arranged in a parallel combination. Give two advantages of this arrangement.
Draw a graph of potential energy vs height from the ground for a body thrown vertically upwards.