O-LevelPhysicsWaves5054/11 · Oct/Nov 2013 · Q221 Mark
The table lists the main components of the electromagnetic spectrum and their approximate frequency range. Which range of frequencies can be used to detect cracks inside a block of metal?
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A10³ Hz to 10¹² Hz
B10¹² Hz to 10¹⁵ Hz
C10¹⁵ Hz to 10¹⁸ Hz
D10¹⁸ Hz to 10²² Hz
✓ Correct answer
D: 10¹⁸ Hz to 10²² Hz
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