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

Subtopic:  Electron Emission |
From NCERT
AIPMT - 1999
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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.
Subtopic:  Electron Emission |
 67%
From NCERT
AIPMT - 2002
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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
Subtopic:  Electron Emission |
 53%
From NCERT
AIPMT - 2003
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch