IBDP Physics- E.5 Fusion- IB Style Questions For SL Paper 1A -FA 2025

Question

A star has a parallax angle of \(1 \times 10^{-2}\) arc-second at the orbit of the Earth. What is the distance from the Sun to the star?

(A) 0.01 pc
(B) 0.02 pc
(C) 50 pc
(D) 100 pc

▶️ Answer/Explanation

Detailed solution

1. Use Parallax Formula:
\(d (\text{parsecs}) = \frac{1}{p (\text{arc-seconds})}\)

2. Substitute Values:
\(d = \frac{1}{1 \times 10^{-2}}\)
\(d = 100\) pc.
✅ Answer: (D)

Question

The nuclear reaction \( {}_1^2\mathrm{H} + {}_1^3\mathrm{H} \rightarrow {}_2^4\mathrm{He} + {}_0^1\mathrm{n} \) would best be described as

A. alpha decay.

B. nuclear fission.

C. nuclear fusion.

D. neutron capture.

▶️Answer/Explanation

✅ Answer: (C)

This is a fusion reaction because two light nuclei (deuterium and tritium) combine to form a heavier nucleus (helium-4), with a neutron released.
In fusion, some mass is converted to energy, so energy is released.

IBDP Physics- E.5 Fusion- IB Style Questions For SL Paper 1A -FA 2025

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