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A trader sold goods worth $6,600 on 31 March 2025 but did not produce the invoice until 3 days later. The sale should be recorded in the year ended 31 March 2025. Which accounting concept applies?
- Consistency
- Prudence
- Realisation
Option D (3 only) is correct.
The realisation concept states revenue is recognised when earned (goods transferred and risks/rewards pass), not when the invoice is raised. The sale was complete on 31 March, so it belongs in that year.
For $h \ll R$, orbital radius $\approx R$.
Orbital velocity: $v_o = \sqrt{\frac{GM}{R}} = \sqrt{gR}$
Escape velocity from orbit at $R$: $v_e = \sqrt{\frac{2GM}{R}} = \sqrt{2gR}$
Minimum increase in speed:
$\Delta v = v_e - v_o = \sqrt{2gR} - \sqrt{gR} = \sqrt{gR}(\sqrt{2}-1)$
Down the group, bond length increases (H–X bond gets weaker), making it easier to release H⁺. Therefore acid strength increases down the group:
\(\text{H}_2\text{O} < \text{H}_2\text{S} < \text{H}_2\text{Se} < \text{H}_2\text{Te}\)
Note: This trend is opposite to electronegativity trend, and is governed by bond dissociation energy.
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