defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Physics Atoms X Rays and the Ordering of the Elements
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of -
1
collisions between the charged particles emitted from the cathode and the atoms of the gas
2
collision between different electrons of the atoms of the gas
3
excitation of electrons in the atoms
4
collision between the atoms of the gas