question_answer

                                                Identify the following from their description. (a) These are the rays produced in the discharge tube. These rays deflect towards the +ve plate in an electric field, and contain the universal constituent of matter. (b) This is a subatomic particle present in all the atoms except Hydrogen. (c) These are rays used by James Chadwick and Rutherford for their important experiments to understand the structure of an atom.

Answer:

The rays deflect towards the\[+ve\]plate in an electric field \[\Rightarrow \]The rays are negatively charged and hence are cathode rays. (b) The sub-atomic particle present in all the atoms except Hydrogen is neutron. (c) Alpha rays.