Please if you don\'t know the answer do not answer anything A laser is emitting
ID: 2078745 • Letter: P
Question
Please if you don't know the answer do not answer anything A laser is emitting at a power of 10m W and exposes a surface of 0.1 cm^2 on the skin. Assume that the laser is pulsed at 1ms. For the above-mentioned laser, SEL= 250 mJ/cm^2 and CEL= 15 mu J/cm^2. which of the following statements is correct based on what is known about the laser? a) The density of energy for the laser is 100 mu J/cm^2. It is hazardous on the eye, but not on skin. b) The density of energy for the laser is 100 mJ/cm^2. It is hazardous on the eye, but not on skin. c) The density of energy for the laser is 100 J/cm^2. It is hazardous on the eye, but not on skin. d) The density of energy for the laser is 100 mJ/cm^2. It is hazardous on the eye, and on the skin. Which of the following statement is false? a) Er: Yng and CO_2 laser can vaporize tissue because they are strongly absorbed in tissue. b) He-Ne is often used in bio stimulation to raise tissue temperature to around 40 degree C. c) Argon and Ni: Yag are the lasers of choice to stop bleeding d) Ni: Yag laser can be efficient in the treatment of capsulotomy e) Er: Yag and CO_2 laser can be used to correct the curvature of the cornea.Explanation / Answer
The power of the laser is 10 mW which gives us 10 mJ/s when you use it for a time period of 1 ms we get 0.00001 Joules of energy. And with respect to the area of exposure, we get 0.0001 J/cm2 which can be written as 100 microJoules/cm2.
Therefore the answer is (a).
In this case the statement (b) is false.