In this problem, we are required to identify the principle used in the construction of cloud chambers for the detection of radiation.
The alpha particles leave visible tracks in the cloud chamber because
(a) Ionization by the alpha particles seeds the formation of clouds where the particles have passed
(b) The kinetic energy of the alpha particles heats the air.
(c) The alpha particle is so energetic that it leaves a smoke trail behind
(d) The alpha particle strikes nitrogen molecules and breaks them into atomic nitrogen.
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