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WalesPhysicsQuick questions
Unit 1 Motion, Energy and Matter
Quick questions on Using radiation to investigate stars: Wien's and Stefan's laws - WJEC A-Level Physics
3short 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 black-body radiation?Show answer
A black body absorbs and emits all wavelengths perfectly. A star is a good approximation, emitting a continuous spectrum whose peak shifts with temperature. The shape of the black-body curve depends on temperature alone, which is what makes it such a powerful diagnostic.
What is q1?Show answer
A star's spectrum peaks at . Estimate its surface temperature. [2 marks]
What is q2?Show answer
State how the luminosity of a black-body star depends on its temperature. [1 mark]
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