Which of the following statement is not correct about the characteristics of cathode rays?
| 1. | They start from the cathode and move towards the anode |
| 2. | They travel in straight line in the absence of an external electrical or magnetic field |
| 3. | Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube |
| 4. | Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube |
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