3. Mass equivalent of 931 MeV energy is
(a) 6.02× 10-23 kg | (b) 1.766× 10-27 kg | (c)2.67× 10-28 kg | (c) 6.02× 10-27 kg |
Solution: Use Einstein equation to convert energy to mass. E = mc2. Put values,
931× 106 × 1.602 2× 10-19 = m × (3×108)2
⇒ m = (931 × 1.6022 × 106 × 10-19)/(3× 108)2
⇒ m = (931 × 1.6022/9) × 106-19-16 = 1491.6482/9 × 10-29
⇒ m = 165.73 × 10-29 kg = 1.6573 × 10-27 kg
(Do you know where from the 1.6022 × 10-19 come?)
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1ev=1.6022×10^-19j
Seerat Anjum
Yes, exactly.
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