NEET 2008 Physics question

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of

(1)Collision between different electrons of the atoms of the gas
(2)Excitation of electrons in the atomsCorrect
(3)Collision between the atoms of the gas
(4)Collisions between the charged particles emitted from the cathode and the atoms of the gas

Answer: (2)

Solution

In a gas-discharge tube at low pressure, charged particles (electrons) accelerated in the strong field collide with gas atoms and raise their electrons to higher energy levels (excitation). When the excited electrons fall back to lower levels they emit radiation of

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Question ID VK-089974