The fluorescent dyes used in the liquid penetrant testing process are most active when energised with black light of what wavelengths? (Å stands for angstrom units)

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Q. The fluorescent dyes used in the liquid penetrant testing process are most active when energised with black light of what wavelengths? (Å stands for angstrom units)

(A) 2.0 × 10-7m (2000Å)

(B) 2.5 × 10-7m (2500 Å)

(D) 3.65 × 10-7m (3650 Å)

Correct Answer - Option(D)
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Q. The fluorescent dyes used in the liquid penetrant testing process are most active when energised with black light of what wavelengths? (Å stands for angstrom units)

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