Quick questions on Thermal physics: internal energy, specific heat capacity and latent heat - OCR A-Level Physics A

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is specific heat capacity?

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You can measure

c

with an electrical method, supplying a known electrical energy

E = VIt

and measuring the temperature rise; heat losses make the measured value an overestimate unless allowed for.

What is q1?

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Convert

25\ ^{\circ}\text{C}

to kelvin. [1 mark]

What is q2?

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How much energy raises the temperature of

2.0\ \text{kg}

of aluminium (

c = 900\ \text{J kg}^{-1}\ \text{K}^{-1}

) by

30\ \text{K}

? [2 marks]

What is q3?

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Explain why the temperature does not change while a pure substance is melting. [2 marks]

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