Physics
What are the particles emitted by radioactive element after 3 consecutive disintegration?

1 alpha 1 beta
2 beta 1 alpha
2 beta 2 alpha
2 alpha 1 beta

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Physics
Planets are

luminous heavenly bodies that twinkle
luminous heavenly bodies that do not twinkle
luminous heavenly bodies revolving around a star
non-luminous heavenly bodies

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