WJEC A Level Physics
WJEC A Level Physics 1.6 Using Radiation to Investigate Stars Exam Questions
Free WJEC A Level Physics exam questions on 1.6 Using Radiation to Investigate Stars, with mark schemes. Covers black body radiation, Wien's law, Stefan's law, spectra and the multiwavelength universe.
1.6 Using Radiation to Investigate Stars exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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A Level Physics Flashcards
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About WJEC A Level Physics 1.6 Using Radiation to Investigate Stars
This topic uses light to find out about stars.
What you need to know
- Black body spectra Peak wavelength shifts with temperature.
- Wien's law λmax T = constant.
- Stefan's law L = 4πr²σT⁴.
- Line spectra Absorption lines reveal elements in stellar atmospheres.
Common mistakes in 1.6 Using Radiation to Investigate Stars
- Using Celsius in Wien's law.
- Forgetting the 4πr² surface area.
- Confusing emission and absorption spectra.
Try three 1.6 Using Radiation to Investigate Stars exam-style questions
1. A star peaks at 500 nm. Find its surface temperature (Wien constant 2.90 x 10⁻³ m K). (1 mark)
Show the mark scheme answer
5800 K.
2. State Stefan's law. (1 mark)
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Power emitted per unit area is proportional to T⁴.
3. Explain how absorption lines form. (2 marks)
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Cooler gas atoms absorb photons of specific energies (1) matching electron transitions, leaving dark lines (1).
1.6 Using Radiation to Investigate Stars FAQs
What does this topic cover?
Black body radiation, Wien and Stefan laws, and stellar spectra.
Why are hot stars blue?
Their peak wavelength is shorter.
What is luminosity?
The total power output of a star.
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
