In an absolute vacuum, does the diameter of a laser beam change over distance? |
- In an absolute vacuum, does the diameter of a laser beam change over distance?
- This may sound dumb, but what makes glass shatter, and not split or crack in half?
- How do veins and arteries bend/twist without blood getting stopped or clogged?
- What exactly is Google's "quantum supremacy" and is this as big of a milestone as they make it out to be?
- How can white light have a continuous spectrum without having infinite energy?
- How many Antigen Receptors are on Helper T cells?
- Helper T Cells and the activation of B and Cytotoxic T Cells?
- Why are some languages (Kanji and Traditional Chinese, for example) written as "pictures", so to speak, and western languages are based more on syllable structures? Is there a historical reason for it?
- How good is the sense of smell in insects such as flies?
- How can bacteria survive our stomach acid and still make us sick?
- Why are equatorial seas lacking in iron?
- How can you add a particular atom to a specific site on a molecule, and not a different site on that molecule?
- Are theropods more related to the Ornithischians or they are more related to Sauropods?
- How did we figure reference temperatures out?
- Why can you dissolve more in a warmer solvent? And why is that the case?
- Are the lagrange points of [for example] earth and sun being displaced by other planets?
- Why does Nile river flow from south to north?
- Is the intermolecular forces between molecules constant ?
- If you were to boil water in a low pressure area making the boiling point less than 100*c, would you still kill the germs?
- How are viruses kept alive in the lab?
- [chemistry] Activated charcoal is good for capturing adulterants from the air and other mediums. Is it possible to reverse this process and determine from activated charcoal what has been captured and in what ratio?
| In an absolute vacuum, does the diameter of a laser beam change over distance? Posted: 25 Oct 2019 06:54 PM PDT How collimated is laser? Is there a spread over distance? [link] [comments]  |
| This may sound dumb, but what makes glass shatter, and not split or crack in half? Posted: 26 Oct 2019 03:54 AM PDT I know glass shatters, but what is the scientific process of shattering instead of cracking or splitting? [link] [comments]  |
| How do veins and arteries bend/twist without blood getting stopped or clogged? Posted: 25 Oct 2019 04:19 PM PDT When a water hose is bent far enough, the flow of water through it is choked and very little water comes out. When we bend our arms or move our legs, shouldnt the same thing happen? [link] [comments]  |
| Posted: 25 Oct 2019 10:50 PM PDT Their video spends a lot of time explaining the basics of quantum computing, but seems rather light on technical details of what they've actually accomplished. What problem does their quantum computer calculate? I assume it's not something interesting like Shor's algorithm, or else they'd be headlining with that. [link] [comments]  |
| How can white light have a continuous spectrum without having infinite energy? Posted: 25 Oct 2019 10:06 AM PDT If white light has a continuous spectrum, then it has an infinite quantity of frequencies as there are an infinite quantity of numbers between any two numbers. (It shouldn't matter that light usually has discontinuities. if it has any continuous regions, this should hold true.) For example, if I have light between 508 and 508.1 THz, I have frequencies that include 508.01, 508.011, 508.0111, etc. and that is only a small subset of the actual range of frequencies. Every single frequency should have a photon with energy equal to Plank's constant times its frequency. So, the minimum energy of a photon in the example range is 3.3660436362×10−19 J. That times infinity is, of course, infinity. Given that white light obviously does not have an infinite amount of energy, how can it possibly have a continuous spectrum? [link] [comments]  |
| How many Antigen Receptors are on Helper T cells? Posted: 25 Oct 2019 07:37 PM PDT If helper T cells have antigen receptors that bind to specific antigens presented on MHC complexes by a macrophage, are there numerous antigen receptors on each helper T cell? Or are there clonal lines of helper t cells with unique antigen receptors? If this is true, do these clonal lines gather in specific locations in the body to best be "placed" for the specific pathogen? [link] [comments]  |
| Helper T Cells and the activation of B and Cytotoxic T Cells? Posted: 25 Oct 2019 07:27 PM PDT When a helper T cell is activated does it always activate both a humoral (B cell) and cell mediated (cytotoxic T cells) response? Do some pathogens elicit only one or a greater percentage of one? If so, does this depend on the specific pathogen? [link] [comments]  |
| Posted: 25 Oct 2019 03:03 AM PDT Why have some languages evolved to be picture languages, whereas western languages are usually based on syllables? It can't be random. There's got to be a certain historical reason for it. I'm sorry if the term "picture" language is incorrect, I tried to think of a better way to describe Kanji/Trad. Chinese and this is the best I came up with. :/ [link] [comments]  |
| How good is the sense of smell in insects such as flies? Posted: 25 Oct 2019 07:59 AM PDT |
| How can bacteria survive our stomach acid and still make us sick? Posted: 25 Oct 2019 04:06 AM PDT |
| Why are equatorial seas lacking in iron? Posted: 25 Oct 2019 08:51 AM PDT |
| Posted: 25 Oct 2019 02:19 AM PDT Hi all, I was wondering how, when designing chemical substances, scientists are able to add a specific atom to an exact location on a molecule, rather than a different location? So for example, if you had a molecule containing a few nitrogen atoms which were available to bind to something new, but you wanted to add an oxygen atom to only one specific nitrogen of your choice. How would you do it? Can you even do it? Any advice or perhaps any relevant links to explain this would be appreciated! Thanks everyone! [link] [comments]  |
| Are theropods more related to the Ornithischians or they are more related to Sauropods? Posted: 25 Oct 2019 02:42 AM PDT Are theropods more related to the Ornithischians or they are more related to Sauropods? I mean is Ornithoscelida theory right or wrong? [link] [comments]  |
| How did we figure reference temperatures out? Posted: 25 Oct 2019 05:34 AM PDT One of the ways to check for the purity of a substance is to boil/melt and check against the expected value,but how do we know the reference in the first place? How do we know that water boils at 100 degrees so we can use it as a reference for tests? [link] [comments]  |
| Why can you dissolve more in a warmer solvent? And why is that the case? Posted: 24 Oct 2019 11:40 PM PDT So, its about compound A getting dissolved in solution B. You insert so much of compound A into solution B until B gets saturated. If you insert more, then it gets oversaturated and A will just sink into the bottom of B (assuming B is in a cup or something). If you heat up this oversaturated solution B, A will start to dissolve in it, such that there is no solid inside of B. If I looked it up correctly, this is the case because the molecules of B move faster and create more space for A to settle in. Which physical/chemical rule is this? Why do you get more space when the molecules move faster? [link] [comments]  |
| Are the lagrange points of [for example] earth and sun being displaced by other planets? Posted: 25 Oct 2019 03:15 AM PDT And if so how big is the displacement compared to the model from wikipedia? [link] [comments]  |
| Why does Nile river flow from south to north? Posted: 25 Oct 2019 04:36 PM PDT |
| Is the intermolecular forces between molecules constant ? Posted: 24 Oct 2019 09:28 PM PDT Hi all, I understand that the strength of intermolecular forces between the molecules are depended on the state of matter which it is in. However, my question is,is there a quantifiable value of the "strength" of these forces. I also understand that to move from a state of matter to another, these bonds must be broken. By adding pressure or temperature to it the enviroment it is it, we are manipulating the variables around the physical property. Love to get some discussion going. [link] [comments]  |
| Posted: 24 Oct 2019 09:54 PM PDT |
| How are viruses kept alive in the lab? Posted: 24 Oct 2019 08:32 PM PDT How are viruses like smallpox and the polio strains kept alive/active in the lab? Do they even need to be functioning to be useful? [link] [comments]  |
| Posted: 24 Oct 2019 08:56 PM PDT Hopefully I got the terminology right with the question. As I understand it activated charcoal is good for capturing adulterants from the air and other mediums. Is it possible to reverse this process and determine from activated charcoal what has been captured and in what ratio? [link] [comments]  |
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