A-LevelPhysicsSuperpositionMay/June 2025Paper 1 Q241 Mark
A teacher removes the turntable from a microwave oven and places a bar of chocolate in the oven. She then switches the oven on for a short time. A stationary wave is formed in the oven. When the chocolate is removed, the teacher observes that there are two small sections of melted chocolate 6.0 cm apart with unmelted chocolate in between. Each section of melted chocolate is located at an antinode. [Diagram shows two melted chocolate spots 6.0 cm apart.] Assume that the speed of the microwaves is 3.0 × 10^8 m s¯¹. What is the frequency of the microwaves emitted by the oven?
A25 MHz
B50 MHz
C2.5 GHz
D5.0 GHz
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of superposition within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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