How many photons per second are emitted by a monochromatic lightbulb (650 nm) that emits 45 w of power? express your answer using two significant figures. if you stand 17 m from this bulb, how many photons enter each of your eyes per second? assume your pupil is 5.0 mm in diameter and that the bulb radiates uniformly in all directions. express your answer using two significant figures.
Answers: 3
.
Another question on Physics
Physics, 21.06.2019 19:30
Two identical 82 mg dust particles very far apart (pee 0) are moving directly toward each other at a speed of 3698 m/s. the charge on each is-719 ? c. determine how close they will get to each other. let k = 9x109 n-m2/c2 & ignore gravity.
Answers: 1
Physics, 22.06.2019 18:30
Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.
Answers: 1
Physics, 23.06.2019 00:10
During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.
Answers: 2
You know the right answer?
How many photons per second are emitted by a monochromatic lightbulb (650 nm) that emits 45 w of pow...
Questions
Mathematics, 25.01.2021 05:30
English, 25.01.2021 05:30
Physics, 25.01.2021 05:30
English, 25.01.2021 05:30
Chemistry, 25.01.2021 05:30
Spanish, 25.01.2021 05:30
Chemistry, 25.01.2021 05:30
Mathematics, 25.01.2021 05:30
