A wire of length 0.84 m is cut into 24 equal pieces. Each piece is then shortened by 2.5 mm. What is the final length of each piece in micrometres?
3.49×104 μm3.49\times10^4\ \mu\mathrm{m}3.49×104 μm
3.25×103 μm3.25\times10^3\ \mu\mathrm{m}3.25×103 μm
3.50×104 μm3.50\times10^4\ \mu\mathrm{m}3.50×104 μm
3.25×104 μm3.25\times10^4\ \mu\mathrm{m}3.25×104 μm
39 exam-style questions on Edexcel GCSE Physics 1.1 Units and quantities, covering 1.1.1 SI units for physical quantities and 1.1.2 Unit prefixes, conversions, significant figures and standard form. Each one has a worked solution and a mark scheme showing where the marks go.