AskScience AMA Series: I'm a psychologist/neuroscientist studying and teaching about social media and adolescent brain development. AMA! |
- AskScience AMA Series: I'm a psychologist/neuroscientist studying and teaching about social media and adolescent brain development. AMA!
- Can any element experience metal bonding under the right conditions?
- Do people with better memory have/maintain more synapses?
- How can they generate enough energy to emit a 10 PW laser beam?
- Three corners of QR code has distinct pattern which indicates the correct direction to read the code. But isn't that enough with only one corner? That way it can contain more data. What is the reason for this?
- Electron Paramagnetic Resonance - How Does It Work?
- How to set up the integrals for voltage in a two wire transmission line?
- Why does a camera obscura work even without a projector?
- Change in wavelength, when light hits a denser medium?
| Posted: 08 Oct 2021 04:00 AM PDT A whistleblower recently exposed that Facebook knew their products could harm teens' mental health, but academic researchers have been studying social media's effects on adolescents for years. I am a Teaching Assistant Professor in Psychology and Neuroscience at UNC-Chapel Hill, where I teach an undergrad course on "Social media, technology, and the adolescent brain". I am also the outreach coordinator for the WiFi Initiative in Technology and Adolescent Brain Development, with a mission to study adolescents' technology use and its effects on their brain development, social relationships, and health-risk behaviors. I engage in scientific outreach on this important topic through our Teens & Tech website - and now here on r/AskScience! I'll see you all at 2 PM (ET, 18 UT), AMA! Username: /u/rosaliphd [link] [comments]  |
| Can any element experience metal bonding under the right conditions? Posted: 07 Oct 2021 05:23 PM PDT |
| Do people with better memory have/maintain more synapses? Posted: 07 Oct 2021 01:48 PM PDT I just learned through an online lecture (found it on youtube by luck) that the brain is constantly changing. New synapses form, old synapses "disappear" etc. The neurologist said, that this is the reason why we inevitably get worse at something when we get better at another thing. But he also said, that scientists still don't know what it is we get worse at, when we get better at something else. My question is: what about those people who have absolute recall? (edit: Hyperthymesia was the word I was missing) Those people that can remember every moment of their life? (I know that those people are very rare but I'm just wondering: what about them?) How can they remember everything of their lives if the number of neurons doesn't really change much after birth? (Or is this part already been proven wrong? The lecture is from 2012 and at that point the professor said that only the hyppocampus can create completely new neurons but not the cortex.) Now if instead, those people just have a brain that has a better ability to create new neurons, that would actually make a lot more sense. Can someone tell me if/what they know? [link] [comments]  |
| How can they generate enough energy to emit a 10 PW laser beam? Posted: 08 Oct 2021 02:08 AM PDT |
| Posted: 07 Oct 2021 07:03 AM PDT |
| Electron Paramagnetic Resonance - How Does It Work? Posted: 07 Oct 2021 11:41 PM PDT Hi! I'm just hoping someone can give me a basic overview of how electron paramagnetic resonance works. I have a basic understanding of how NMR works, but wasn't really able to find a solid, easy to understand overview of EPR. The wikipedia page seemed to give an ok explanation, but I want to confirm I've understood it correctly. Thanks in advance to anyone who can help :) [link] [comments]  |
| How to set up the integrals for voltage in a two wire transmission line? Posted: 07 Oct 2021 11:31 PM PDT Why is the first integral for the first integral for both V_a and V_b in this problem (only the first one on the page) from r to ∞? Isn't there supposed to be zero charge inside a conductor? So shouldn't the lower integration bound be at the outer end of the conductor? I thought that maybe they were assuming the center of the conductor was location at position (0,0) and hence the distance would be r, but the conductors can't both be at the origin, can they? Are we using a separate coordinate system for each one? I'm not sure that makes sense since we ultimately want the voltage between them. I understand the rest of the problem -- it's just the integration bounds being the same for both voltages that has me a little confused. [link] [comments]  |
| Why does a camera obscura work even without a projector? Posted: 07 Oct 2021 01:22 PM PDT I recently read about the concept of camera obscura and how the light rays pass through the pinhole in order to create an upside down image. What i don't fully grasp, however, is why does an image form in the first place, when there is no projector-like device generating it? If the wall containing the pinhole were removed entirely, no image would be formed at all on the opposite wall. It is this difference that confuses me. When there is no wall (or the pinhole is very large), a lot more rays come in yet no image is formed, so why does the much smaller amount of rays passing through the pinhole actually creates an image? [link] [comments]  |
| Change in wavelength, when light hits a denser medium? Posted: 07 Oct 2021 07:32 AM PDT I am aware, that when light hits a medium, it slows down and therefore changes in wavelength. I would like to know big an alteration in wavelength takes place when it hits glass and similar surfaces. I would also like to know if the type of glass/surface - that is, whether it be reflective, diffracting, absorbing or scattering - has different degrees of impacts on wavelength alteration. If light were to hit a standard camera lens with or without reflective coating, would the shape of the lens have any further impact on the wavelength? What happens exactly, when light hits the sensor on a camera? Wouldn't the entire spectrum of wavelengths contained within said light be imposed on it? Given a reflective surface filmed with a camera, wouldn't it be possible for a camera to show light in a photo that is outside of the human eye's range of vision? How big would the shift in wavelength with surfaces and lenses be? How would I go about calculating the shift in wavelength mathematically? [link] [comments]  |
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