Why did it take 16 hours for the first message to cross the atlantic via a cable? |
- Why did it take 16 hours for the first message to cross the atlantic via a cable?
- How effective is the vaccine against each of the different covid variants?
- The outer electron of a Cesium-133 atom reverses its direction of spin when exposed to microwave radiation of precisely 9.19263177 GHz, which is the basis of the atomic clock. But what happens if the frequency is off slightly? What if it's a Hertz or two too high or too low? How does the atom react?
- Is the virus that causes CoViD so bad because it is so novel (we were never exposed as children) or because there is something inherently bad in its structure/code?
- Why are some cancer cells not detected by the immune system?
- How does H. Pylori bacterium increases the amount of HCl produced? Or how does H. Pylori increases the activity of the proton pump?
- Why does cancer appear so many years later?
- Do superheavy element ores expand from radioactive decay on geological time scales?
- An optical lens performs a Fourier transform for certain light sources. Is a camera aperture an adjustable low pass filter?
- Why would a classically allowed barrier still have a reflective wave?
- What happens when all electron holes are filled in LED light?
- How are COVID test false positive and negative rates determined?
- What's the relationship between population density and SARS-CoV-2 positive density?
- How do gene mutations work when we have two copies of each chromosome?
| Why did it take 16 hours for the first message to cross the atlantic via a cable? Posted: 11 Sep 2021 01:10 PM PDT According to everything I have read it took 16 hours for the signal to cross, but none state why. how is it possible for electricity to slowdown to under 200 miles per hour? Why did it only take 1 hour for the return journey? [link] [comments]  |
| How effective is the vaccine against each of the different covid variants? Posted: 11 Sep 2021 08:35 AM PDT i'm specifically talking about comparing the OG virus against the South African variant, the British variant and the Delta variant. is there any (noticeable) difference in how effective the vaccine is? [link] [comments]  |
| Posted: 11 Sep 2021 12:40 PM PDT |
| Posted: 12 Sep 2021 12:47 AM PDT |
| Why are some cancer cells not detected by the immune system? Posted: 11 Sep 2021 10:40 PM PDT |
| Posted: 11 Sep 2021 05:17 PM PDT |
| Why does cancer appear so many years later? Posted: 11 Sep 2021 04:05 PM PDT The toxic dust from 9/11 caused hundreds/thousands of cancer cases every year. If the cancer cases happened a year or two after the initial exposure I'd understand. But why are they so latent/dormant for so many years? Is it because the dust was just 'sitting' in their lungs doing damage over years? [link] [comments]  |
| Do superheavy element ores expand from radioactive decay on geological time scales? Posted: 11 Sep 2021 07:23 PM PDT So Uranium for instance eventually winds up as Lead which is stable in geological time. Since the neucli of atoms take up almost none of the space and its mostly the electron cloud, does the presence of all the extra atoms (presumably mostly helium) that result from decay cause the ores to expand while still buried? If no, where do the new atoms (probably mostly helium?) go? [link] [comments]  |
| Posted: 11 Sep 2021 09:57 PM PDT |
| Why would a classically allowed barrier still have a reflective wave? Posted: 11 Sep 2021 08:50 PM PDT According to this article which reddit can't handle the link,(https://phys.libretexts.org/Bookshelves/University_Physics/Book%3A_University_Physics_(OpenStax)/Book%3A_University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/07%3A_Quantum_Mechanics/7.07%3A_Quantum_Tunneling_of_Particles_through_Potential_Barriers), and wiki page, even when the energy of a travelling wave is higher than the barrier, there is a probability that the wave will be reflected. [link] [comments]  |
| What happens when all electron holes are filled in LED light? Posted: 11 Sep 2021 05:27 PM PDT As I understood electrons cross into the area with atoms that have electron holes and when electrons combine with electron holes laws of physics dictate some energy must be emitted and if materials are right a lot of this emission is light. But what happens when all the electron holes are filled? How do electrons go away to leave free electron holes for next batch of electrons? Or do I misunderstand how electron holes work? [link] [comments]  |
| How are COVID test false positive and negative rates determined? Posted: 11 Sep 2021 05:21 PM PDT How do scientists determine if a false positive or negative occurred? Do they have a test more accurate than the test they are testing? How would they determine a false positive or negative on the most accurate test we have? [link] [comments]  |
| What's the relationship between population density and SARS-CoV-2 positive density? Posted: 11 Sep 2021 01:16 PM PDT |
| How do gene mutations work when we have two copies of each chromosome? Posted: 11 Sep 2021 12:37 AM PDT Suppose you have a mutation that interferes with a gene. For example a deletion mutation in CFTR gene that causes cystic fibrosis. Don't we have two copies of chromosome 7? Why isn't the other chromosome sufficient in producing CFTR? How does this relate with haploinsufficiency? [link] [comments]  |
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