Physics Coursework GCSE
What causes feedback in a guitar or microphone?
Just for the record, feedback is actually the mechanism used to control almost every electronic device manufactured. Stability is a critical issue for all of these feedback control systems, and the gain, or level of amplification, used is a critical element in their design. When musicians talk about feedback, however, the connotation is negative because it is the term they use to describe the shreek that results when the gain is too high on the output of an amplified instrument or microphone. There are several potential mechanisms by which feedback can occur when sound is amplified. Let’s deal first with the simple case of a microphone and an amplified speaker. (See the figure, but ignore the guitar for now.) Feedback occurs when a "loop" between an input and output is closed. In this scenario, the microphone serves as the input and the amplified speaker provides the output.
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Peer Reviews
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Quality of writing
The tone of the piece is wrong from the offset as it is in a very nonchalant and discussion tone manner whereas in a scientific piece the tone should be purely factual with no opinion apart from in the conclusion when all facts have been analysed. Punctuation, grammar and spelling all okay.
Level of analysis
The candidate begins by explaining the concept of feedback. It is a good attempt but it gets slightly confusing to follow in places without any previous knowledge of feedback as there are not base concepts mentioned. No diagrams are used which makes it harder to understand. This is repeated throughout the piece.
Response to question
The concept of feedback is explained to some degree by the candidate using a variety of examples. The main problem being the confusing nature of some of the examples that were use and lack of support diagrams.