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# 1. Find the power of a laser, if the irradiance is 1500w/cm2and all the laser's output...

1. Find the power of a laser, if the irradiance is 1500w/cm2and all the laser's output power is focused on a circular spot with a 16um (micrometer) diameter

 a. 0.0042watts or 4.02mw b. 0.0062watts or 6.02mw c. 0.0032watts or 3.02mw d. 0.0082watts or 8.02mw

2. Consider a pupil opening 5mm (0.5cm) in diameter. What is the maximum HeNe power allowed for a 0.25second exposure? (By exposure, we mean looking directly into the beam-intrabeam viewing or directly viewing a specular reflection of the beam). Use the MPE chart

 a. 3.2mW b. 0.54mW c. 0.5mW d. 0.49mW

3. what is the speed of the wave with amplitude a=0.15m, wavelength=0.80m, frequency=0.5Hz

 a. 0.2m/s b. 0.80m/s c. 0.5m/s d. 0.4m/s

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