Which of the following statements is correct about the cathode rays? 1. These rays start from anode and move towards cathode. 2. They are visible with human eye. 3. In presence of electric and magnetic fields, they behave like positively charged particles. 4. Their characteristic does not depend on the nature of material at electrode.

Step-by-step solution

Characteristics of cathode rays are : (1) The cathode rays start from cathode and move towards the anode. Thus, statement (1) is incorrect. (2) These rays themselves are not visible but their behaviour can be observed with the help of phosphor materials such as ZnS. Thus, statement (2) is incorrect. (3) In the absence of electrical or magnetic field, these rays travel in straight lines. In the presence of electrical or magnetic field, the behaviour of cathode rays are similar to that expected from negatively charge