Suppose that you have a 10 Watt green LED lamp, that emits light at a wavelength of 535 nm uniformly in all directions. 1) Suppose that you look at the lamp from a distance of 3 meters. If your face has an area of 175 cm2 facing the LED, how many photons from the lamp hit your face each second?
Answers: 2
Physics, 21.06.2019 23:30
Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?
Answers: 1
Physics, 22.06.2019 10:10
In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?
Answers: 1
Physics, 22.06.2019 11:10
An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?
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Physics, 22.06.2019 15:00
For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat
Answers: 1
Suppose that you have a 10 Watt green LED lamp, that emits light at a wavelength of 535 nm uniformly...
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