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(B) In the phenomenon of electric discharge through gases at low pressure,a high potential difference is applied across the electrodes.This causes the

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collisions between the charged particles emitted from the cathode and the atoms of the gas

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(B) In the phenomenon of electric discharge through gases at low pressure,a high potential difference is applied across the electrodes.This causes the emission of charged particles (electrons) from the cathode.These high-speed electrons collide with the neutral gas atoms present in the tube.These collisions cause the excitation and ionization of the gas atoms.When these excited atoms return to their ground state,they emit light of specific wavelengths,which results in the characteristic coloured glow observed in the discharge tube.

In the phenomenon of electric discharge through gases at low pressure,the coloured glow in the tube appears as a result of
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In the phenomenon of electric discharge through gases at low pressure,the coloured glow in the tube appears as a result of[$AIPMT$ $2008$]