Which of the following statement is not correct about the characteristics of cathode rays?
(i) They start from the cathode and move towards the anode.
(ii) They travel in straight line in the absence of an external electrical or magnetic field.
(iii) Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.
(iv) Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.

Answer: Option (iv)
Solution:
Characteristics of cathode rays are:
(i) Cathode rays start from cathode and move towards the anode.
(ii) These rays themselves are not visible but their nature can be observed with the help of phosphor materials such as ZnS.
(iii) In the absence of electrical or magnetic field, these rays travel in straight lines.
(iv) In presence of electrical or magnetic field, the nature of cathode rays are similar to that expected from negatively charged particles, suggesting that the cathode rays consist of negatively charged particles, called electrons.
(v) The characteristics of cathode rays (electrons) do not depend upon the material of electrodes and the nature of the gas present in the cathode ray tube.
Hence, Option (iv) is a wrong statement here.

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