Which of the following statements regarding the... - JAMB Physics 2023 Question
Which of the following statements regarding the application of electrical conduction via gases is/are correct?
Electrical conduction in gas is applied in:
(i) The identification of gases
(ii) Lighting/fluorescent tubes
(iii) Photocells
(iv) Cathode ray oscilloscope/T.V. tubes
(i), (iii) and (iv) only
(i), (ii) and (iv) only
(ii), (iii) and (iv) only
(i), (ii) and (iii) only
(i) The identification of gases: True
- Electrical conduction in gases can be used for the identification of gases in a process called gas discharge tubes. Different gases emit characteristic colors when subjected to electrical discharges, allowing for identification.
(ii) Lighting/fluorescent tubes: True
- Fluorescent tubes and some types of lighting tubes operate by using electrical conduction in gases. The electrical discharge in these tubes excites the gas, producing ultraviolet radiation, which then causes phosphor coating to emit visible light.
(iii) Advertising industry/Neon signs: Not mentioned in the provided options.
- Neon signs in the advertising industry also use electrical conduction in gases. The electrical discharge in neon gas produces the characteristic glow in neon signs.
(iv) Cathode ray oscilloscope/T.V. tubes: True
- Cathode ray oscilloscopes and TV tubes use electron beams in a vacuum rather than electrical conduction through gases.
Therefore, the correct statements are (i), (ii), and (iv).
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