Here’s my question explained with a little more detail….
Room #1: Blackout curtains/blinds/shades have been drawn for one day. No sunlight whatsoever has entered the room that entire day.
Room #2: All curtains/blinds/shades have been kept open the entire time. However, the blackout curtains/blinds/shades have now been drawn, at the end of the day.
A scientist enters each now-darkened room. Can the scientist accurately detect or measure which room was the “sunnier” room during that day?
Putting aside long-term sun bleaching, which I understand can lighten fabrics when they are exposed to sunlight over a long period of time, my question is whether the photons of sunlight from a single day could be detectable, objectively, at the end of that day. Does sunlight “change” anything that can be measured, after the light is gone?
In: Physics
I think the only thing that would be measurable would be the residual energy. A black wall would absorb the sunlight throughout the day, and then slowly emit that back through the night. So someone could come in and measure like the temperature of the room, or the infrared radiation being emitted from the walls
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