Which of the following is not correct about the characteristics of cathode rays?

When analyzing the properties of cathode rays, it is crucial to address the question, "Which of the following is not correct about the characteristics of cathode rays?" Below are some of the key properties of cathode rays:

• Travel in straight lines: Cathode rays move in straight lines when no external electric or magnetic field is applied.
• Independence from electrode material: The characteristics of cathode rays are independent of the material used for the electrodes in the cathode ray tube.
• Dependence on external influences: Cathode rays are deflected by electric and magnetic fields, which proves their negative charge.
• Independence from the nature of gas: The behavior and properties of cathode rays do not rely on the type of gas present in the cathode ray tube.

Now, to address "Which of the following is not correct about the characteristics of cathode rays?", consider the statement regarding the nature of the gas in the tube. This characteristic highlights the universal behavior of cathode rays, irrespective of the gas type, making such a statement correct. However, any contradiction to these well-established properties would be incorrect.

When preparing for questions like "Which of the following is not correct about the characteristics of cathode rays?", understanding these properties helps in accurately identifying false statements or misconceptions.