Which of the following releases single wavelength of energy ?
Correct answer: B. Argon lasers
- A. QTH
- B. Argon lasers
- C. LED
- D. PAC
Explanation
An argon laser produces energy concentrated at characteristic, very narrow wavelengths, often described as monochromatic. QTH, PAC and LED curing lights emit broader ranges of wavelengths.
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