IB · B · multiple choice
The particulate nature of matter · Question 1
The particulate nature of matter · Original GioPhysics question with a detailed, mark-by-mark answer guide.
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multiple choice1 mark
A 2.0 kW heater supplies energy to 0.30 kg of ice at 0 °C until it has all melted. The specific latent heat of fusion of ice is 3.3 × 10⁵ J kg⁻¹. How long does this take, assuming no losses?
- A
5.0 s
- B
50 s
- C
165 s
- D
500 s
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Answer overviewCorrect answer: B — 50 s
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is B: 50 s
- 2
The energy required is mL = 9.9 × 10⁴ J, and dividing by 2000 W gives 50 s. C divides by the mass instead of multiplying by it.
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