Chemistry Unit 2

Spectrometry

Katie Bennett

Spectrum

Definition:      rays               means,                   

Introduction to Spectroscopy

Spectroscopy is a complex art - but it can be very useful in helping scientists understand how an object like a   or active galaxy is producing light, how fast it is moving, and even what elements it is made of. A  is simply a chart or a graph that shows the intensity of light being emitted over a range of energies. Spectra can be produced for any energy of light - from low-energy  waves to very high-energy  

Spectra are complex because each spectrum holds a wide variety of information. For instance, there are many different mechanisms by which an object, like a star, can produce light - or using the technical term for light, electromagnetic radiation. Each of these mechanisms has a characteristic spectrum.

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The Electromagnetic Spectrum

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White light (what we call  or optical light) can be split up into its constituent colours easily and with a familiar result - the rainbow. All we have to do is use a slit to focus a narrow beam of the light at a prism. This set-up is actually a basic  

The resultant rainbow is really a continuous spectrum that shows us the different energies of light (from red to blue) present in visible light. But the electromagnetic spectrum encompasses more than just optical light - it covers all energies of light extending from low-energy radio waves, to ...

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The language used by the candidate is a little too simplistic for this level of qualification and very few technical terms are used. For example there is a point in the essay in which the candidate states that the electromagnetic spectrum covers all energies of light, they should have used the term electromagnetic radiation instead of word light which is misleading. This shows that the candidate’s level of understanding of these topics is only average. Furthermore there are some errors which punctuation and grammar.

The candidate starts this piece for work by stating a definition, this can be useful when writing about a scientific topic, however the definition given is unclear, which makes me question the candidate’s understanding. In addition to this the candidate does not give a clear introduction. You should always introduce the topic you are discussing, a good introduction should introduce your essay title, state the topics you plan to discuss and engage the reader, which you can do by stating interesting facts or even a quote that is related to your set topic. By catching the readers attention, you ensure that they will invest time in reading all of your essay instead of skimming through it. In addition to this the candidate also fails to write any kind of conclusion, which is a mistake. You should always try to conclude your work. A good conclusion should summarise key points from within your essay and should include a personal response. This allows you to bring the essay to a close.

The candidate has attempted to give a fairly detailed response and it is evident that they have taken the time to undergo independent research. This is shown by the inclusion of a bibliography at the end of the essay. By taking the time to throughly research your topic, you demonstrate dedication and an interest in your subject.