Here's what a star student thought of this essay
Quality of writing
The candidate uses technical terms accurately through the essay and their work is fairly coherent which demonstrates an understanding of the concepts they have discussed. In addition to this there are no real issues with either spelling or grammar.
Level of analysis
I feel that the candidate's response to the set topic and their analysis is a little weak, the topic is annihilation theory, so a good start would be to discuss this, what it means and how the theory was discovered. Furthermore the candidate’s entire essay seems to focus on the ideas of Andrei Sakharov and his theories for creating antimatter. A good quality essay should cover several key points and theories relating to your set topic, you can also show a good understanding of physics by bringing together several different topics, this demonstrates a good subject knowledge and a general enthusiasm for physics. Though the information relating to this particular scientist’s ideas, is a nice addition and is interesting to read, it would of been more suitable to discuss this briefly and move on to another idea. That said, I would also recommend writing a short bibliography if you undergo any independent research, you should state any sources you use and if you use information from an online source you should also provide a link to that webpage.
Response to question
The candidate’s introduction starts well, it is interesting and they have attempted to engage the reader by stating that the imbalance between matter and antimatter is unusual and goes against predictions made using the laws of physics. By using your introduction to catch the attention of the reader, you make them interested in what you have to say, making it more likely that they will read all of your essay rather than just skim through it. However an introduction should state what you plan to discuss so that premise of your essay is clear and the candidate fails to do this.