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Which is the correct ascending order of wavelengths?

1. λ visible < λ X-ray < λ gamma-ray < λ microwave
2. λ gamma-ray < λ X-ray < λ visible < λ microwave
3. λ X-ray < λ gamma-ray < λ visible < λ microwave
4. λ microwave < λ visible < λ gamma-ray < λ X-ray

Correct answer: λ gamma-ray < λ X-ray < λ visible < λ microwave

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