Red-Shift & Big Bang — GCSE Physics Revision
Revise Red-Shift & Big Bang for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Solar System & OrbitsWhat is Red-Shift & Big Bang?
Red-shift is the observed increase in the wavelength of light from distant galaxies. It is evidence that the galaxies are moving away from us. The further away a galaxy is, the greater its red-shift, which means it is moving away faster. This observation supports the Big Bang theory, which states that the universe began from a very hot, dense point and has been expanding ever since.
Board notes: A Higher Tier topic for all major GCSE Physics boards (AQA, Edexcel, OCR). The evidence for the Big Bang theory (red-shift and CMBR) is crucial.
Step-by-step explanationWorked example
Light from a distant galaxy is observed to be red-shifted. What does this tell us about the galaxy? Solution: The red-shift of the light tells us that the galaxy is moving away from us. By measuring the amount of red-shift, we can calculate the speed at which it is receding.
Mini lesson for Red-Shift & Big Bang
1. Understand the core idea
Red-shift is the observed increase in the wavelength of light from distant galaxies. It is evidence that the galaxies are moving away from us.
Can you explain Red-Shift & Big Bang without copying the notes?
2. Turn it into marks
Light from a distant galaxy is observed to be red-shifted. What does this tell us about the galaxy?
Underline the method, evidence, or command-word move that would earn credit in GCSE Space Physics.
3. Fix the likely mark leak
Watch for this mistake: Confusing red-shift with the Doppler effect for sound. The principle is similar, but red-shift applies to light.
Write one correction rule before doing another practice question.
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Red-Shift & Big Bang practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Red-Shift & Big Bang is testing.
Answer: Red-shift is the observed increase in the wavelength of light from distant galaxies. It is evidence that the galaxies are moving away from us.
Mark focus: Precise definition and topic focus.
Question 2
A Red-Shift & Big Bang question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing red-shift with the Doppler effect for sound. The principle is similar, but red-shift applies to light." What should their next repair task be?
Answer: Do one Red-Shift & Big Bang question and review the mistake type.
Mark focus: Error correction and next-step practice.
Red-Shift & Big Bang flashcards
Core idea
What is the main idea in Red-Shift & Big Bang?
Red-shift is the observed increase in the wavelength of light from distant galaxies. It is evidence that the galaxies are moving away from us.
Common mistake
What mistake should you avoid in Red-Shift & Big Bang?
Confusing red-shift with the Doppler effect for sound. The principle is similar, but red-shift applies to light.
Practice
What is one useful practice task for Red-Shift & Big Bang?
Answer one Red-Shift & Big Bang question and review the mistake type.
Exam board
How should you use board notes for Red-Shift & Big Bang?
A Higher Tier topic for all major GCSE Physics boards (AQA, Edexcel, OCR). The evidence for the Big Bang theory (red-shift and CMBR) is crucial.
Common mistakes
- 1Confusing red-shift with the Doppler effect for sound. The principle is similar, but red-shift applies to light.
- 2Thinking that red-shift means the light is red. It means the light is shifted towards the red end of the spectrum (longer wavelength).
- 3Not understanding the link between red-shift and the Big Bang. The observation that distant galaxies are moving away from us in all directions implies that the universe is expanding from a single point.
Red-Shift & Big Bang exam questions
Exam-style questions for Red-Shift & Big Bang with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Red-Shift & Big Bang
Core concept
Red-shift is the observed increase in the wavelength of light from distant galaxies. It is evidence that the galaxies are moving away from us. The further away a galaxy is, the greater its red-shift, …
Frequently asked questions
What is the Big Bang theory?
The Big Bang theory is the leading scientific theory for how the universe began. It proposes that the universe started as an extremely hot, dense point about 13.8 billion years ago and has been expanding and cooling ever since.
What is cosmic microwave background radiation (CMBR)?
CMBR is faint microwave radiation that is present throughout the universe. It is considered to be the leftover heat from the Big Bang and is one of the strongest pieces of evidence for the theory.