Astrophysics - Unit Detail
16 lessons, 1 hour each
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Lesson 2.2 – The electromagnetic (EM) spectrum and the doppler effect
In this lesson students will explore:
- That visible light makes up only a very small component of the electromagnetic spectrum and that there is a huge range of other 'types' of EM radiation that we can use to investigate objects.
- What the Doppler Effect is and how it can be used to calculate the speed of a moving object.
- How the chemical composition of an object can be determined by looking at the emission and absorption spectra it produces.
- What types of telescopes are useful for looking at various sources of electromagnetic radiation.
- The chemical composition and relative movement of an object that can be measured through an analysis of the light that it emits or reflects.
Learning SequenceShow all resources
Welcome students to this lesson and encourage several of the students new to this unit to introduce themselves to each other and the class.
Investigation – Teacher uses the Prezi presentation 2.2.1 to introduce students to the EM spectrum. Students explore the colours of light to see that these are characterised by different frequencies and only a small part of the total EM spectrum. Students are also introduced to emission and absorption spectra. Final students are introduced to the Doppler Effect. Resources
Discussion – Watch Activity (2.2.2), The Big Bang Theory video clip of Dr Sheldon Cooper explaining the Doppler Effect and invite comments and responses from the students. Resources
Collaboration – Students revise the properties of waves and the features needed to perform calculations using the General Wave Equation v = λ f, and f = 1/T. Students then break into groups and complete Activity (2.2.3) the wave theory questions available from the shared NVSES Google site. Resources
Reflection – Students are then brought back together as a whole class and teacher leads students through a discussion of their relevant answers to each of the parts from Activity (2.2.3).
Activity (2.2.4) - NASA – Goddard website Imagine the Universe, EM Spectrum. Resources
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Activity (2.2.5) – Telescopes and the EM spectrum; an optional research work sheet for advanced students.
In their NVSES blog students complete the following statement: During today's lesson, I found it particularly difficult to _________. Something I can do to improve on this aspect of my learning next lesson is ___________.