Part A A loudspeaker on a tall pole broadcasts sound waves equally in all directions. What is the speaker's power output if the sound intensity level is 87.0 dB at a distance of 18 m? Express your answer with the appropriate units. HA ? P = Value UnitsPart A Using a dish-shaped mirror, a solar cooker shown in (Figure 1) concentrates the sun's energy onto a pot for cooking. A cooker with a 2.1-m-diameter dish focuses the sun's energy onto a pot with a diameter of 25 cm. Given that the intensity of sunlight is about 1000 W/m, what is the intensity at the base of the pot? Express your answer with the appropriate units. I HA ?V Part A LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0-mm-diameter laser beam with a wavelength of 193 nm. Each laser pulse lasts 15 ns and contains 2.0 mJ of light What is the power of one laser pulse? energy. Express your answer with the appropriate units. HA 0: ? P = Value Units Submit Request Answer Part B During the very brief time of the pulse, what is the intensity of the light wave? Express your answer with the appropriate units. HA ? I = Value Units Submit Request