In a discharge tube, most of the gas is pumped out so that…
In a discharge tube, most of the gas is pumped out so that electricity is conducted at
A. steady voltage
B. high pressure
C. low pressure.
D. low voltage.
A discharge tube is a sealed tube where a small quantity of gas is subjected to low pressure and high voltage in other to conduct current and induce fluorescence (or lighting). The high voltage is usually applied at two electrodes, and the gas inside the sealed tube is excited into light when it is made to conduct current under a low pressure.
Now for the right answer to the above question:
- Option A is incorrect. voltage must be high enough to cause gas conduction of current.
- Option B is incorrect. the pressure must be low rather.
- C is correct. Yes, low pressure.
- D is not the correct answer. High voltage rather.
You may please note these/this:
- When the isolated gas inside the sealed tube is subjected to low pressure and high voltage, they begin to conduct current, and in the process begin to glow.
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/ culled from 2017 JAMB-UTME physics question 7 /
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