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Where's the Banana?

Science brain teasers require understanding of the physical or biological world and the laws that govern it.


Puzzle ID:#28032
Fun:*** (2.66)
Difficulty:** (1.64)
Submitted By:Question_MarkAsx******
Corrected By:zigthepig




Skid Mark felt like doing a hard challenge one day. Question Mark was very happy to give him a challenge. He took a banana, a sheet of white paper, a red ball, and a few random things and put them all in a room where only red light could be seen. He found the ball and the paper no problem. Why couldn't he find the banana as easily?

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Jan 11, 2006

this was perrty cool. i didn;t know about the banana with the red light though. good teaser
Jan 11, 2006

Good teaser and informative! Nice job!!
Jan 12, 2006

I'm more than happy to lose a banana. Could I find some red chocolate instead?
(user deleted)
Jan 12, 2006

This is the first teaser
On this site I have read
Though I am not sure
If the room light was red

Jan 12, 2006

I Actually got it right!
Jan 12, 2006

Good teaser, though I thought it was backwards of actual events. If it was a lit room with red light, and only a certain frequency of red light could be seen, then the black banana would stand out, while the red paper and red ball would be virtually impossible to locate without ... slipping over the banana peel onto them.
Jan 12, 2006

Good teaser, i didnt get it though , little too smart for me
Good Job
Jan 15, 2006

banas reflect yellow light, which is a mixture of red and green light, so it would still be visible
Jan 16, 2006

red, green! d finder was blind.
Jan 17, 2006

WoW! Ya learn something new everyday! GREAT teaser thanks to the sender ;)
Jan 19, 2006

The creator of this riddle obviously had only a low level knowledge of optics. If "only red light can be seen" things appear red or black. The banana would reflect a significantly darker image than the other objects, but I stand corrected in that it would indeed not be black. Either way, I contend that it would be the easiest of the three objects to see.
(user deleted)
Mar 16, 2006

I knew it had something to do with how we see colors. . .
May 31, 2006

It all depends on the background to provide a contrast for the items to show clearly, but we don't know the colour of the walls and floor. If white/red, the banana would show up, if blue/green/yellow etc the paper and ball would show up clearer. (I would have thought).
Jun 02, 2006

Mr. Highlevel, Mr. Background and others missed the bus on this one. In Skid Mark's universe bananas are yellow, not black. So to him just change the color it's gone. It's called a teaser...and it was a good one.
Jun 02, 2006

Yes, bananas are yellow, and not just in Mark's universe. But they don't look yellow in red light. They absorb red frequencies of light, so appear to be black. That was the point of the teaser. The background surely has to camouflage it though to make it difficult to see.
May 11, 2008

Great teaser, complaints notwithstanding. A quick Google search yields: YES, yellow light is a mix of red and green light spectrums--more red than green, by the way.

SO: the YELLOW banana peel would REFLECT the red light, making it visibly red, just like the ball and paper. Whether the banana peel seems darker depends on if only one or multiple (visible) frequencies are present, and the frequency(ies) of the available light.

If it IS darker, it depends on the contrast of the surface the items are laying on. Most LIKELY, there will not be a discernable difference, and ALL OBJECTS would be JUST AS easy or hard to find.

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