Question:
Tick (✓) the correct answer:
66 cm3 of silver is drawn into a wire 1 mm in diameter. The length of the wire will be
(a) 78 m
(b) 84 m
(c) 96 m
(d) 108 m
Solution:
(b) 84 m
Length $=\frac{\text { volume }}{\pi r^{2} 2}=\frac{66 \times 7}{22 \times 0.05 \times 0.05}=8400 \mathrm{~cm}=84 \mathrm{~m}$
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