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Increasing order of penetrating power: α < β < γ.

1. For same energy, lighter particle has higher penetrating power.
2. α < β < γ.
3. γ > β > α.
4. Penetrating power depends on energy.

Correct answer: α < β < γ.

Solution

The penetrating power of radiation increases in the order α < β < γ due to their respective masses and interaction with matter. Alpha particles are heavy and lose energy quickly, beta particles are lighter, and gamma rays are massless and highly penetrating.

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