Question 1
A nuclear reaction releases 4.5 × 10⁻¹³ J of energy. What is the corresponding mass defect?
Worked answer
🔒 Start free to see full answer
Physics · Unit 1 · Ionising radiation and nuclear reactions · Nuclear model and stability
Solve problems involving the mass–energy equivalence relationship using ∆𝐸 = ∆𝑚𝑐2.
Practise this objective
AI-marked practice questions tied to QCAA mark schemes for this exact LO. Free to start.
Start free practicePractice questions for this objective
Full questions, answers and worked solutions unlock when you start a free practice session.
Question 2
In a nuclear fusion reaction, two deuterium nuclei (²₁H) combine to form a helium-3 nucleus (³₂He) and a neutron (¹₀n). The mass of a deuterium nucleus is 3.3436 × 10⁻²⁷ kg, the mass of a helium-3 nucleus is 5.0082 × 10⁻²⁷ kg, and the mass of a neutron is 1.6749 × 10⁻²⁷ kg. Calculate the energy released in this fusion reaction in joules. Show your working.
Worked answer
🔒 Start free to see full answer
Question 3
A nuclear reaction converts $3.2 \times 10^{-3}$ kg of matter into energy. Calculate the energy released by this reaction. (Give your answer in joules to 2 significant figures.)
Worked answer
🔒 Start free to see full answer