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23 Nov 2019
Experiments have shown that the nervous system of the human eyeeffectively takes 30 "frames" per second (like a movie camera) andthat when the eye is fully dark-adapted, it needs to receive onlyabout 500 photons per frame from an object to register it. Our sunradiates a power of about 3.9x1026 at all wavelengths,peaking in the yellow region of the spectrum (only about one-halfof this energy is in the visible range, however).
Estimate how far away a star like the sun could be and still bevisible.
Experiments have shown that the nervous system of the human eyeeffectively takes 30 "frames" per second (like a movie camera) andthat when the eye is fully dark-adapted, it needs to receive onlyabout 500 photons per frame from an object to register it. Our sunradiates a power of about 3.9x1026 at all wavelengths,peaking in the yellow region of the spectrum (only about one-halfof this energy is in the visible range, however).
Estimate how far away a star like the sun could be and still bevisible.
Lelia LubowitzLv2
22 Nov 2019
