O-LevelPhysicsEnergy & WorkOct/Nov 2024Paper 1 Q171 Mark
A wind-up radio is used in areas where mains electricity is not available. [Figure of a wind-up radio with a handle]. A person winds a spring in the radio using the handle. When the spring unwinds, it makes a small coil rotate in a magnetic field. Which energy transfer is not useful for this radio?
Aelastic potential energy → kinetic energy
Bkinetic energy → thermal energy
Cchemical energy → elastic potential energy
Dkinetic energy → sound energy
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The correct answer is B. This question tests the candidate's understanding of energy & work within the Physicssyllabus. The examiner's mark scheme requires...
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