Quiz - Physics - Colors

[Storker]

When the water is that cold

...it's go dive or or quit diving

 

[Storker]

Lake Ontario...

View attachment 580996

Northeast Atlantic...

Diver and dead man's fingers at DS Jarl
Diver in spring bloom

 

[kmarks]

I try not to dive cold water (then again, I live in Iowa), so I've never experienced Storker's bonus question, but I found that really interesting and something I had never thought about before.

Anybody seen this video:
We show this in our open water classes, and I'm almost never asked why the pink stays pink and the orange barely changes, but as a chemist who specializes in

Spoiler: why

putting fluorescent tags on DNA

I always have an answer.

 

[Dizzi Lizzi]

Darn it I failed!

 

[Storker]

Spoiler: why

putting fluorescent tags on DNA

Fluorescence is cheating.

 

[Rusty Shackleford]

Spoiler

Geek here: scattering, type depends on the size of the particles. If really small particles, Rayleigh scattering, tends to give a blue color (Why is the sky blue?), so even in shallow water things look blue. That's from memory, how'd I do?

The sky is blue because the Earth possess a sufficient gravitational pull to retain an nitrogen/oxygen atmosphere.

 

[kmarks]

The sky is blue because the Earth possess a sufficient gravitational pull to retain an nitrogen/oxygen atmosphere.

Factoid: No, it's because of Rayleigh scattering. Blue light is higher energy, so it scatters laterally across the sky. Other wavelengths of lower energy are pulled downwards by earth's gravity. That's why the sun appears yellow and the sky appears blue.

See definition 2: Definition of factoid | Dictionary.com

 

[tursiops]

I hope nobody is reading this....stuff....and believes it!

 

[BlueTrin]

Factoid: No, it's because of Rayleigh scattering. Blue light is higher energy, so it scatters laterally across the sky. Other wavelengths of lower energy are pulled downwards by earth's gravity. That's why the sun appears yellow and the sky appears blue.

See definition 2: Definition of factoid | Dictionary.com

Factoid^2: It must be blue because it's deep and the other wavelengths have been absorbed !

 

[Storker]

The sky is blue because the Earth possess a sufficient gravitational pull to retain an nitrogen/oxygen atmosphere.

Huh? Pls elaborate.