Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Medium-Class 12
A discharge tube contains a gas at a very low pressure of 0.001 mm of mercury. What is the primary reason for the glow observed between the electrodes when an electric field is applied?
A
Ionization of gas molecules by the electric field.
B
Spontaneous emission of photons by gas molecules.
C
Thermal excitation of gas molecules due to low pressure.
D
Formation of a solid-state plasma in the gas.
Correct Answer
Option A
Detailed Explanation
At low pressure, the gas molecules in the discharge tube are ionized by the applied electric field, which results in the observed fluorescent glow.
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