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SS3: PHYSICS - 1ST TERM

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  1. Energy & Society
    5 Topics
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    1 Quiz
  2. Electromagnetic Waves
    2 Topics
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    2 Quizzes
  3. Gravitational Field
    8 Topics
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    1 Quiz
  4. Electric Field I
    5 Topics
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    1 Quiz
  5. Capacitance & Capacitor
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    1 Quiz
  6. Electric Field II
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    1 Quiz
  7. Electric Field III
    4 Topics
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    1 Quiz
  8. Electric Field IV
    4 Topics
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    1 Quiz
  9. Conduction Through Liquids
    5 Topics
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    1 Quiz
  10. Conduction Through Gases
    5 Topics
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SS3: PHYSICS – 1ST TERM Conduction Through Gases Theory Questions – Conduction Through Gases
Lesson 10, Topic 5
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Theory Questions – Conduction Through Gases

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Topic Content:

  • Theory Questions & Answers - Conduction Through Gases

Theory Questions - Conduction Through Gases:

1 .

The diagram above illustrates a cathode ray tube. Identify the components X, Y, and Z. ( WAEC 2016 )

2.

The diagram above 

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Theory Questions & Answers – Conduction Through Gases

1.

The diagram above illustrates a cathode ray tube. Identify the components X, Y, and Z.

Answer:

X – filament/heater/cathode
Y – anode
Z – plate(s)/deflector(s)

 

2.

The diagram above illustrates an arrangement of a cathode ray from an electron gun and a bar magnet placed perpendicularly to the direction of the ray. Will the ray bend downward or upward? Explain.

Answer:

Cathode rays are negatively charged particles. When they are placed in a magnetic field, the negatively charged particles are attracted towards the north pole and hence the beam seems like it got deflected towards the north pole.

The negatively charged particles in the diagram will bend away from the South Pole.

The direction of motion of the charge is due to the force acting on it which is mutually perpendicular to the direction of the magnetic field and the moving charge.

 

3. (a) Explain how neon signs can be produced.

Answer:

A discharge tube at very high p.d. filled with neon and evacuated to a very low pressure of about 5 mm will produce a discharge between the electrodes with a characteristic colour.

The tube contains mercury or sodium vapor which glows at very low pressure at the passage of rays. The cathode rays cause the emission of ultraviolet rays when they bombard the mercury vapour. The interior of the fluorescent tube is coated with phosphorus, which gives off visible light when hit by ultraviolet rays.

(b) State two factors on which the colour of light from a fluorescent tube depends.

Answer:

The colour of light produced in a fluorescent tube depends on:

  1. Nature of the gas in the tube.
  2. Nature of the coatings in the tube.

 

4. (a) Explain thermionic emission.

Answer:

Thermionic emission is the release of electrons from the surface of heated metals. It is a surface phenomenon and the rate of electron emission increases with temperature increase.

(b) State two applications of electrical conduction through gases.

Answer:

  • identification of gases
  • in advertising neon signs
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