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Questions and Answers
Gases are poor conductors of electricity, and their conductivity can be increased by:
Gases are poor conductors of electricity, and their conductivity can be increased by:
- Decreasing the pressure and/or decreasing the potential difference between the electrodes.
- Increasing the pressure and decreasing the potential difference between the electrodes.
- Increasing the pressure and/or increasing the potential difference between the electrodes. (correct)
- Decreasing the pressure and increasing the potential difference between the electrodes.
The specific charge of cathode rays depends on:
The specific charge of cathode rays depends on:
- It is a universal constant. (correct)
- The material of the discharge tube.
- The potential difference between the cathode and anode.
- The nature of the gas.
Which of the following is not a fundamental particle?
Which of the following is not a fundamental particle?
- Proton
- X-rays (correct)
- Neutron
- Electron
The ratio of anode rays produced in the discharge tube depends on:
The ratio of anode rays produced in the discharge tube depends on:
Millikan's oil drop experiments are used to find:
Millikan's oil drop experiments are used to find:
An element having atomic number and atomic weight will have:
An element having atomic number and atomic weight will have:
Positive ions are formed from the neutral atom by the:
Positive ions are formed from the neutral atom by the:
The minimum real charge on any particle which can exist is:
The minimum real charge on any particle which can exist is:
The increasing order for the values of (charge/mass) is:
The increasing order for the values of (charge/mass) is:
Which is not true with respect to cathode rays?
Which is not true with respect to cathode rays?
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Study Notes
Conductivity of Gases
- Gases are bad conductors of electricity.
- Conductivity can be increased by decreasing the pressure and/or increasing the potential difference between the electrodes.
Cathode Rays
- Specific charge of cathode rays is a universal constant.
- Cathode rays are a stream of electrons.
- They can be deflected by an electric field, but don't move with the same speed as light.
Fundamental Particles
- Electron, proton, and neutron are fundamental particles.
- X-rays are not a fundamental particle.
Anode Rays
- The ratio of anode rays produced in a discharge tube depends on the nature of the gas filled in the tube.
Millikan's Oil Drop Experiment
- Millikan's oil drop experiment is used to find the charge on an electron.
Atomic Structure
- An element with atomic number and atomic weight will have protons and neutrons.
Ion Formation
- Positive ions are formed from a neutral atom by the loss of electrons.
Minimum Real Charge
- The minimum real charge on any particle that can exist is not zero.
Charge-to-Mass Ratio
- The increasing order of values for (charge/mass) is n, p, e.
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