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Photons and discrete energy levels

Photons and discrete energy levels

Energy-level diagram of bound electron states showing absorption and emission between negative energy levels

Electromagnetic radiation from stars can be described by waves, with c=fλc = f\lambdac=fλ, or by photons, with E=hfE = hfE=hf. Combining the two gives E=hcλE = \frac{hc}{\lambda}E=λhc​, so shorter wavelengths mean more energetic photons.

Electromagnetic radiation from stars Lesson

  1. A Level
  2. /Physics
  3. /Electromagnetic radiation from stars

Step-by-step lessons on OCR A A Level Physics Electromagnetic radiation from stars. Each one builds up to exam-style questions. Physics is one of the most mathematically demanding A Levels -- at least 40% of the marks across the three papers require maths skills at Level 2 (GCSE) standard or above, so build calculation and graph-handling fluency alongside the conceptual content from the start.

Lessons