question_answer 90)

  Which of the following statements is not correct about the characteristics of cathode rays? (a) They start from the cathode and move towards the anode (b) They travel in straight line in the absence of an external electrical or magnetic field (c) Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube (d) Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube

Answer:

  (d) e/m ratio does not change by changing the gas filled in discharge tube hence characteristics of cathode rays are independent of the gas filled in cathode ray tube.