Physics (AS & A Level) · May / June 2025 · Paper 13 · Question 27
An electromagnetic wave travelling in free space is not visible to the human eye. What is a possible wavelength of the wave?
- A4.5 × 10⁻¹⁰ km
- B6.2 × 10⁻⁷ m
- C5.4 × 10⁻⁶ cm
- D4.2 × 10⁻⁴ mm
As printed in the paper
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Correct answer: C. 5.4 × 10⁻⁶ cm
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