Multiple choice

Which of the following is called alpha rays?

  1. High energy electromagnetic radiations

  2. Stream of electrons

  3. Helium atoms that have lost two electrons

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alpha particles consist of two protons and two neutrons, which is identical to the nucleus of a helium atom (a helium atom that has lost its two electrons).

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