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A 100-W bulb emits red light ( = 700 nm) uniformly in all directions. a) How many photons are emitted by the bulb each second? b) A dark-adapted eye can sense this light if as few as 50 photons per second enter the pupil. What is the largest distance from the bulb that light can be sensed? { Assume a pupil diameter of 5 mm. }

A 100-W bulb emits red light ( = 700 nm) uniformly in all directions. a) How many photons are emitted by the bulb each second? b) A dark-adapted eye can sense this light if as few as 50 photons per second enter the pupil. What is the largest distance from the bulb that light can be sensed? { Assume a pupil diameter of 5 mm. }

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A 100-W bulb emits red light (1 = 700 nm) uniformly in all directions. a) How many photons are emitted by the bulb each second? b) A dark-adapted eye can sense this light if as few as 50 photons per second enter the pupil. What is the largest distance from the bulb that light can be sensed? { Assume a pupil diameter of 5 mm. }
Transcribed Image Text:A 100-W bulb emits red light (1 = 700 nm) uniformly in all directions. a) How many photons are emitted by the bulb each second? b) A dark-adapted eye can sense this light if as few as 50 photons per second enter the pupil. What is the largest distance from the bulb that light can be sensed? { Assume a pupil diameter of 5 mm. }
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