Red shift as sources move away; the 'Big Bang' and universal expansion — WJEC GCSE Physics
In summary: Red shift as sources move away; the 'Big Bang' and universal expansion is a key topic in WJEC GCSE Physics. Key exam tip: Ensure you can explain red shift in qualitative terms only as per the specification
Exam Tips for Red shift as sources move away; the 'Big Bang' and universal expansion
- Ensure you can explain red shift in qualitative terms only as per the specification
- Link the concept of red shift directly to the evidence for the Big Bang model
- Use precise terminology when describing the shift towards the red end of the electromagnetic spectrum
Common Mistakes
- Confusing red shift with the Doppler effect for sound without relating it to light
- Failing to specify that red shift is observed in galaxies that are receding
- Incorrectly describing the relationship between distance and the speed of recession
Marking Points
- Red shift occurs when light sources move away from the observer
- The wavelength of light from distant galaxies is increased (shifted towards the red end of the spectrum)
- The change in wavelength with distance is evidence that the universe is expanding
- The observation of red shift supports the Big Bang model of the universe
← Back to Physics WJEC GCSE Specification · All Physics Topics