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EXAM TALKBACK

Exponential changes in an oximeter

Some exam questions ask you to apply your physics knowledge to unfamiliar situations. This question is about exponential change in a medical device

It may seem surprising, even unfair, but examination questions can use situations that you have never studied, and may even refer to physics beyond the limits of your specification. These questions always provide any new information that you will need and therefore do not test any knowledge outside the specification. However, all the exam boards do say that they will assess how well students ‘interpret scientific information to make judgements and reach conclusions’. This is something you should expect and prepare for.

The question discussed in this Exam talkback is about an oximeter — a device invented in Japan in the 1970s, which led to a 40-fold reduction in deaths during anaesthesia. More recently it has been used to monitor the wellbeing of patients with severe COVID-19 symptoms.

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