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KVPY2019ChemistryStructure of Atom

Among the following, the correct statement about cathode ray discharge tube is

Options

  1. Athe electrical discharge can only be observed at high pressure and at low voltage.
  2. Bin the absence of external electrical or magnetic field, cathode rays travel in straight lines.
  3. Cthe characteristics of cathode rays depend upon the material of electrodes.
  4. Dthe characteristics of cathode rays depend upon the gas present in the cathode ray tube.

Correct answer

B. in the absence of external electrical or magnetic field, cathode rays travel in straight lines.

Step-by-step solution

Cathode ray is observed only at low pressure and high voltage, which travel in straight line in the absence of electrical and magnetic fields. Characteristics of cathode rays are independent of the material of electrode or the gas present in the tube.

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