Answered: The longest wavelength of light humans… | bartleby

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The longest wavelength of light
humans can see is around 750 nm,
deep red. If we were to observe a
green - colored space probe
approaching a stellar black hole of 20
solar masses, how close to the event
horizon would it be when it just
turned invisible? Green light has a
wavelength around 520 nm. Answer
in km Answer:Question 4

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