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There are also subjects, such as Japanese and Chinese, with 200 UMS available for the A-level and 100 for the AS. Some A-levels (e.g. Mathematics and single sciences) retain the 600 UMS mark system. Raw marks awarded in an exam are converted to UMS marks according to the difficulty of the exam paper and the performance of candidates.
From the academic year starting September 2023, Edexcel International GCSE exams are conducted in June and November. The last session for January Exams is January 2023 (Academic Year September 2022 to August 2023) and the first session for November Exams is November 2023 (Academic Year September 2023 to August 2024). [8]
In 2022, advance information was given by examination boards to students, providing them with information on what topics would or would not be on the exam. However, in the Physics paper 1 exam, a topic that was stated as "Not Assessed" came up; AQA accepted the mistake and awarded all students the full 9 marks to the question. [70]
For the leptons, the gauge group can be written SU(2) l × U(1) L × U(1) R. The two U(1) factors can be combined into U(1) Y × U(1) l, where l is the lepton number. Gauging of the lepton number is ruled out by experiment, leaving only the possible gauge group SU(2) L × U(1) Y. A similar argument in the quark sector also gives the same result ...
The energy efficiency of a fuel cell is generally between 40 and 60%; however, if waste heat is captured in a cogeneration scheme, efficiencies up to 85% can be obtained. [citation needed] In 2022, the global fuel cell market was estimated to be $6.3 billion, and is expected to increase by 19.9% by 2030. [13]