The total energy of an electron is \(3.555~\text{MeV}\). Its kinetic energy will be:
1. \(3.545~\text{MeV}\)
2. \(3.045~\text{MeV}\)
3. \(3.5~\text{MeV}\)
4. none of the above
Which of the following is not the property of cathode rays:
1. | it produces a heating effect. |
2. | it does not deflect in the electric field. |
3. | it casts a shadow. |
4. | it produces fluorescence. |
J.J. Thomson's cathode-ray tube experiment
demonstrated that:
1. | cathode rays are streams of negatively charged ions |
2. | all the mass of an atom is essentially in the nucleus |
3. | the e/m of electrons is much greater than the e/m of protons |
4. | the e/m ratio of the cathode ray particles changes when a different gas is placed in the discharge tube |