Why is anything radioactive in movies, portrayed as a green glow? | AskScience Blog

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Friday, July 29, 2016

Why is anything radioactive in movies, portrayed as a green glow?

Why is anything radioactive in movies, portrayed as a green glow?


Why is anything radioactive in movies, portrayed as a green glow?

Posted: 28 Jul 2016 07:30 PM PDT

Since protons have mass would 2 protons try to go towards each other, but then repel at a certain (closer) distance because they are both positive?

Posted: 28 Jul 2016 07:25 PM PDT

When exactly does the repel happen, and at what distance?

submitted by /u/Gansei
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What's going on in my head when I'm thinking of an image?

Posted: 29 Jul 2016 07:13 AM PDT

What could have emitted the "Oh-My-God" particle (a likely proton caught traveling with 99.99999999999999999999951% of the speed of light?

Posted: 28 Jul 2016 01:35 PM PDT

The Wiki page doesn't mention its origin.

submitted by /u/tarandfeathers
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Why do particles traveling faster than light cause a blue glow?

Posted: 29 Jul 2016 03:45 AM PDT

Such as in a nuclear reactor when the particles in water are traveling faster than light, and the water glows blue. What about going FTL is causing that? As a follow up question, would the same happen in space if we ever figure out how to go FTL in a vacuum?

submitted by /u/2scared
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What are the long term effects of massive antihistamine usage?

Posted: 29 Jul 2016 05:54 AM PDT

What are the approximate effects of large doses of antihistamines in general and, in particular, Fexodenadine Hydrochloride? For example, a daily dosage of anything between 180mg per day to 720 mg per day.

  • What are the long term effects of such massive, constant overdoses?
  • Do antihistamines fuck with the immune system or ultimately make any symptoms worse, especially if medication is not taken as usual?
  • Does sensitivity to the medication wear down over time?
  • Are there any organs that are likely to suffer damage from this type of (regular) overdose?
  • Are there any studies on people with allergic reactions or long term overdose of antihistamines? (Things to either read about or become involved in.)
submitted by /u/decidedlyindecisive
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Are Alpha Particles Affected by Electrons?

Posted: 29 Jul 2016 04:17 AM PDT

I learnt radiactivity in school today and learnt about the Geiger–Marsden experiment.When my teacher mentioned that alpha particles passing by the nucleus would be diverted because alpha particles have a positive charge and the nucleus is positively charged I asked if electrons would have any effect on alpha particles she simply said it was unlikely that the particles would ever come close to the electrons and then went on with the lesson.

My question is is this true,if so why? And even if the number of instances was very small theoretically if it did happen would the alpha particles be affected or not and if not why so?

submitted by /u/nik263
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Source of Uranium and plutonium?

Posted: 29 Jul 2016 04:13 AM PDT

I am not a science graduate! dont really know much about chemicals. i jst wanted to know where did they came from? i know they were extracted from ore! But how did they came into ore? Myths says, they came from bones of animals and rotten woods! so what it is really?

PS: brief answers would be helpful rather then using chemical terms

submitted by /u/aintanselmo
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Why doesn't Oxygen react with the Iron in stainless steel?

Posted: 29 Jul 2016 06:04 AM PDT

I took AP Chemistry this past school year and being the nerd that I am, this question came to mind while staring at a pot. I know stainless steel is both an interstitial alloy and substitutional alloy with Iron, Chromium, and Carbon. When explaining alloys, many books say that stainless steel doesn't rust because the Chromium in the material reacts with the Oxygen creating a protective layer of Chromium Oxide on the surface of the material.

So I guess my real question is, "Why doesn't the Oxygen in the air also react with the Iron on the surface of the stainless steel along with Chromium." Is it simply because Chromium has a higher electron affinity?

Thanks for all helpful replies!

submitted by /u/Zman130
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Why is water so good at transferring heat?

Posted: 28 Jul 2016 10:29 PM PDT

[Physics] Why are diffusion coefficients in units m^2/s?

Posted: 29 Jul 2016 07:53 AM PDT

Thermal & mass transfer diffusion coefficients (as well as kinematic viscosity relating to momentum transfer) all carry the same set of units. Is there any physical significance to the m2/s? Is there a way to visualize what a m2/s represents as related to diffusion? Or are the units arbitrary, and were chosen just to satisfy the transport equations?

submitted by /u/what_is_thisss
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Is it be possible to build a pyramid/tower high enough to jump out of Earth's orbit?

Posted: 28 Jul 2016 11:43 PM PDT

Or would the boundaries of orbit change because of the building and never become possible?

submitted by /u/zjbird
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Why does fission happen randomly?

Posted: 28 Jul 2016 11:29 PM PDT

It seems for a given nucleus either the Coulomb repulsion would overcome the strong force, or the vice versa. From where does probability get involved?

submitted by /u/options_questioner
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How do TEM waves propagate down two conductor transmission lines?

Posted: 29 Jul 2016 12:46 AM PDT

If there is a time varying Voltage driving the input of the transmission lines, and a load at the other end, why is there no electric field perpendicular to direction of propagation?

Transmission line theory treats TEM waves as perpendicular to direction of propagation.

If Electric field is the negative gradient of voltage, and the voltage is a sine wave, would there be a component of electric field along the wire?

If looking at this Poynting vector diagram, the transmission lines show the electric field and magnetic field as Transverse to current flow, but in the resistor the poynting vector points radially inward. is this due to the presence of a resistance?

submitted by /u/Grosso_
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Why do Wi-Fi protocols use symmetric encryption instead of asymmetric encryption?

Posted: 29 Jul 2016 05:32 AM PDT

I was doing some reading earlier and found out that most WiFi security protocols use symmetric encryption, making them painfully vulnerable to things like man-in-the-middle attacks. It seems like asymmetric encryption would cover up that massive security flaw.

submitted by /u/ImAStupidFace
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On a molecular level, why does the material of an object affect the force experienced in a collision?

Posted: 28 Jul 2016 06:26 PM PDT

Sorry in advance if this is moronic, but I've always really been confused about this. In physics we learned of course that to decrease the force in a collision you want to increase the time of contact with whatever the object is hitting. This is due to conservation of momentum so hitting a pillow produces a smaller reaction force than hitting concrete because a ball is in contact with longer with the pillow than with the concrete.

What doesn't make sense to me is that why doesn't it experience a strong force the moment it hits the pillow. I'm talking on a molecular level like when the outer atoms of the ball hit the outer atoms of the pillow, wouldn't the initial contact between the atoms of the objects be the same regardless of the material so the force would be extremely high? Or am I over thinking it?

I have a picture to maybe explain what I mean better because I realize this isn't too understandable what I'm getting at. In the picture I have the bottom box to show what I mean about individual atoms of the two objects and how I don't understand how the material makes a difference. Like wouldn't they experience the impulse as soon as the atom of the ball touches the first layer of the ground; whether it be pillow or concrete? And said impulse of the atoms would have the same time with both materials so the force would be the same.

Here's the picture to maybe explain my reasoning better

submitted by /u/stars_bitch67
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How(and why) is 'c' the speed limit of the universe?

Posted: 29 Jul 2016 03:57 AM PDT

And why can any other substance (massless or not) cross it?

submitted by /u/hmpher
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Why are some cooling towers at power plants "hyperboloid" shaped?

Posted: 28 Jul 2016 10:58 AM PDT

Why do things in the distance look bigger when we are seeing with our eyes than on camera?

Posted: 28 Jul 2016 11:18 AM PDT

So last night space junk flow into the atmosphere and it streaked across the sky, and it looked MASSIVE!!! It was probably one of the most amazing things I have I pulled out my camera, tried to take it a picture, and it looked super small and didn't look remotely cool it all.... Why does this phenomenon ha ppen? I know I am not the only one because I have seen memes on the internet joking about it:

http://images-cdn.9gag.com/photo/aLKvQdV_700b_v3.jpg

submitted by /u/scarereeper
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Does smell always correspond to substance?

Posted: 28 Jul 2016 11:12 AM PDT

Sometimes I'll wash a substance off my hands or other parts very thoroughly, with agents, and the odour will still be present, like ketchup, chlorine or crap. Does that mean there's still remaining substance, or can some odours exist quasi-independently?

submitted by /u/Rumple28
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Why do some clouds look like they're moving but sometimes they look still?

Posted: 29 Jul 2016 02:22 AM PDT

What materials have surpassed nature in some way?

Posted: 28 Jul 2016 11:48 AM PDT

I know that it took us a long time to develop something that approached the strength/mass ratio of spiderwebs.
Are there some other materials that we have that are unrivaled in nature/space in terms of some special/impressive quality?

submitted by /u/vgneus
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Can Digital goods (Such as the ones from Steam) have an adverse effect on the economy?

Posted: 28 Jul 2016 09:57 PM PDT

Since the concept of Supply and Demand is one of the most basic and important topics in economics, I've been wondering what would happen if you had a product that had an infinite supply (i.e., digital goods).

What effects (both good and bad) could digital goods have on the market or economy? And is it even affected by the concept of Supply and Demand in the first place?

submitted by /u/VillainousToast
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