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2answers
38 views

Colors of the Earth from space, an “average” of particular emitters?

When we're say about 100 km above Earth's ground and look down to it and see the Amazonian region as green, is this green color a sort of "average" of greens from trees from that forest or is the "...
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1answer
64 views

How big would an object look at a certain distance?

I've tried looking this up and found that objects only appear smaller because of the curvature of the eye. For example: the flowers are the same size, but since the second flower is farther, angle ...
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1answer
34 views

How to phrase the question of measuring the frequency of a complex sound?

I was hoping I could crowd source some understanding. Im interested in understanding the measuring of sound pitch. From what I've been able to gather thus far- sounds are waves of air pressure and ...
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1answer
48 views

Could we recognise if time was running at a different rate for one species than another? I.e a human and an ant

My question is quite simple if time ran at a different speed for smaller creatures, how would we be able to observe this or confirm by experiment?
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0answers
46 views

Why does scratching a blackboard gives such a painful noise?

I think we all have heard that terrible sound coming from scratching a blackboard with your nails. How is it produced? Has it something to do with the length of our nails?
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0answers
25 views

Binocular vs. monocular field of view in head-up displays

I've been reading about head-up displays in Wiki: Head-up display and understand that it works such that an image from an LCD screen (automotive) or from a cathode ray tube (aviation) is projected to ...