Bimetallic strip consists of two metals with different coefficients of linear expansion. On heating, one expands more, causing bending. Used in thermostats, fire alarms. Expansion difference causes curvature.
Explanation:
An alpha particle consists of two protons and two neutrons tightly bound together. This is completely identical to the nucleus of a helium atom (He²⁺). Alpha particles are positively charged, relatively massive, have low penetrating power, and are emitted by heavy radioactive elements during alpha decay.
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