It is both sensible and acceptable to annotate and add to the diagram to show what happens to the wave front. Don’t forget to discuss what happens as the wave leaves the block too.

Remember to use the key word 'refract' to describe what is happening and indicate whether the wave moves towards or away from the normal.

Consider which side of the beam of light enters the block first, and the effect of the block on the wave as well. Plan the key points that you should include in your answer. The wave front changes direction again so it is parallel to its original direction. At the other face, point A exits the block first so the process is reversed. The whole wave front changes direction towards the normal. So naturally, we decided to lure in book nerds everywhere by having an original song composed using the lyrics Kiera Cass wrote in THE SIREN. Point B is still in air so is travelling faster than point A, this causes part of the wave front to refract. Point A moves into the glass block and slows down as light travels more slowly in glass than in air. Point A reaches the glass block before point B. Your explanation should refer to ultraviolet, ultrasound and seismic waves. Sample question 1 - Foundation and Higher QuestionĮxplain the differences between longitudinal and transverse waves. Often, you will be asked to compare two things: make sure that you include both in your answer otherwise, you are likely to limit your score to two marks out of six marks.Įdexcel questions courtesy of Pearson Education Ltd. It is essential that you give as many different points in your answer as possible, linking these together. TOP-DRAW TAILORED WIGS WITH EMPRESS CUSTOM LACE Recommendations: Use a ceramic flat or curling iron at 200C to revive curly styles Type of hair: 100 Premium. The number of marks per question part is given in this form: ' '. It does this because…'Įxplain how and why questions often have the word 'because' in their answer. If you are asked to explain why a pattern or trend is seen in a graph, you will be expected to use your science knowledge, not just say what you see (which is a description), eg 'The graph shows the number of radioactive nuclei decreases as time increases. If you are asked to describe a graph, you will be expected to write about its overall shape, whether it is linear or curved, the slope of gradients etc. The command words 'describe' and 'explain' can be confusing. Six-mark questions will start with command words such as 'describe' or 'explain'. Without a plan it is easy to stray away from the key point and lose marks, get steps in a process in the wrong order or forget key bits of information. After all, you would plan an essay or short story before starting. In all longer answer questions, but especially the six-mark ones, it is important that you plan your answer and not just rush into it. Six-mark questions are often the questions that people find the most difficult.

Into the waves the siren