When a proton and anti-proton annihilate, the energy release is ______?
Lecturer Physics Past Papers and Syllabus / All — Multiple-choice practice
جب ایک پروٹون اور اینٹی پروٹون فنا ہوجاتا ہے تو ، توانائی کی رہائی ______ ہوتی ہے؟
- A. 3x10⁻⁸ J
- B. None of these
- C. 3x10⁻⁶ J
- D. 3x10⁻¹⁰ J
Correct answer
3x10⁻¹⁰ J
Explanation
Explanation When a proton and anti-proton annihilate, the energy release is equal to the sum of their rest mass energies. The rest mass energy of a proton (or anti-proton) is approximately: E = mc² = (1.67 × 10⁻²⁷ kg) × (3 × 10⁸ m/s)² ≈ 1.5 × 10⁻¹⁰ J Since both the proton and anti-proton annihilate, the total energy release is: E_total = 2 × 1.5 × 10⁻¹⁰ J ≈ 3 × 10⁻¹⁰ J
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