In the last 5-10 years, there’s been tremendous efforts made by many of the first world countries to curb carbon emissions. Have we made a dent? |
- In the last 5-10 years, there’s been tremendous efforts made by many of the first world countries to curb carbon emissions. Have we made a dent?
- Why doesn't microwave energy escape through the holes in the screen of a microwave oven?
- Why is an Alpha particle denoted as a Helium atom?
- If Radiation is cumulative in our body, is Bluetooth (even with BLE) harmful to humans if we are constantly exposed to it with cellphones, smartwatch, etc. and also from other's electronic devices around us?
- Are there any "weird" uses for heavy/transuranic elements?
- How can we get only sunlight through glass without heating the building?
- If we travel 65 million light years, we would be able to see the extinction of dinosaurs, but how is that possible and why?
- Why in some metals is the Hall Effect opposite of what is expected? Like in aluminum for example, say in your set up you expect a buildup of negative charge at the top side of the sample, but instead you get it at the bottom.
- How does Ozone stop UV-B and UV-C from reaching the earths surface, what makes it different from nitrogen that allows it to stop the radiation?
- How does the SpaceX Merlin rocket engine achieve a TWR of 300?
- Why are thermal images so blurry? What is hard about making thermal imaging lenses?
- Do man made magnets affect the Earth's magnetic field?
- How can electrons and holes have different mobility within a semiconductor?
- Will we ever be able to see beyond the edge of our observable universe? As time goes on we are able to see further and further, but is the edge just going to stay the same, or possible have less to see since the outer galaxies are expanding faster?
- Is there a difference between electrets and ferroelectric materials?
- If the speed of sound is around 420 knots at 30,000 feet, why did Chuck Yeager have to go over 700 mph to break the sound barrier?
- Are there any events in history or pre-history similar to the now discredited Tabo Catastrophe?
- Why was Miranda discovered almost a century after the rest of the major moons of Uranus were discovered?
- How do you break time reversal symmetry without breaking inversion symmetry?
- Scientifically what makes a food burnt And at what state and why does burntness taste so distinct?
- Are there any stars that have multiple stars orbiting them?
| Posted: 19 Apr 2018 06:40 PM PDT Where do we stand on present day global carbon emissions vs say 10-20 years ago? [link] [comments]  |
| Why doesn't microwave energy escape through the holes in the screen of a microwave oven? Posted: 19 Apr 2018 03:03 PM PDT I've heard the classic explanation as to the wavelength being longer than the spatial frequency of the holes, so the radiation can't "see" the holes. But this is hard for me to visualize since the spatial frequency of the holes would be orthoganol to the wavelength of radiation. Can anyone provide an intuitive explanation? [link] [comments]  |
| Why is an Alpha particle denoted as a Helium atom? Posted: 19 Apr 2018 03:43 PM PDT How is it that we aren't getting cancer after inhaling large volumes of helium gas to change our voice as kids? What makes an alpha particle highly ionizing but not helium gas? [link] [comments]  |
| Posted: 20 Apr 2018 03:41 AM PDT |
| Are there any "weird" uses for heavy/transuranic elements? Posted: 19 Apr 2018 08:04 AM PDT I recently came across the fact that Americium is used in smoke detectors (Wikipedia). Are there any other interesting applications of other heavy elements? [link] [comments]  |
| How can we get only sunlight through glass without heating the building? Posted: 20 Apr 2018 02:34 AM PDT Sunlight is excellent but it comes with heat, so how do we get only sunlight in a building without heating it up? [link] [comments]  |
| Posted: 19 Apr 2018 02:59 PM PDT |
| Posted: 19 Apr 2018 02:05 PM PDT In my solid state materials lecture, this was asked as one of our thought starters for lecture last week, and we never really got a satisfactory answer as to why that is. I know it has to do somewhat with the wave-particle duality of the electron, but what exactly that has to do with it I'm not sure. Any good explanations or links to articles for more reading are appreciated! [link] [comments]  |
| Posted: 19 Apr 2018 07:23 PM PDT |
| How does the SpaceX Merlin rocket engine achieve a TWR of 300? Posted: 19 Apr 2018 04:40 PM PDT |
| Why are thermal images so blurry? What is hard about making thermal imaging lenses? Posted: 19 Apr 2018 02:26 PM PDT |
| Do man made magnets affect the Earth's magnetic field? Posted: 19 Apr 2018 06:56 PM PDT I just learned that we've made much stronger magnets than Earth's own magnetic field. The largest magnet reaches 25 tesla but Earth only puts out about 0.000065 tesla. Do they interfere with Earth's? Why does Earths magnetic field reach so far but ours don't? Does that play a role in it? [link] [comments]  |
| How can electrons and holes have different mobility within a semiconductor? Posted: 19 Apr 2018 07:59 PM PDT Holes are just the absence of a balancing electron, so how do electrons move (on average) at a different rate than their absence and vice versa? [link] [comments]  |
| Posted: 19 Apr 2018 01:34 PM PDT |
| Is there a difference between electrets and ferroelectric materials? Posted: 19 Apr 2018 10:58 AM PDT With Wikipedia as my only resource I'm having trouble differentiating the two. What are some common applications for these materials ? [link] [comments]  |
| Posted: 19 Apr 2018 02:41 PM PDT I've been playing DCS World and noticed how the speed of sound is different at different altitudes. And also, the Bell X-1 was dropped from around 29,000 feet. It seems to make sense that Chuck Yeager would've had to only go about 500 kn to achieve Mach 1.06. Edit: he actually flew to 45,000 feet, so it seems he could have gone even slower to reach Mach 1. [link] [comments]  |
| Are there any events in history or pre-history similar to the now discredited Tabo Catastrophe? Posted: 19 Apr 2018 03:23 PM PDT I heard about the Tabo Catastrophe Theory a while ago and recently saw after some help from a user on r/geology that the theory is no thought to not be true. Are there any examples from planetary science of genetic bottlenecks or loss of civilizations or communities due to natural catastrophe? [link] [comments]  |
| Posted: 19 Apr 2018 05:31 PM PDT Oberon and Titania were discovered in 1787, Umbriel and Ariel were discovered in 1851 but Miranda was only discovered in 1948 almost 100 years after the previous moons were discovered. How did we miss that Uranus had a fifth moon until after we figured out nuclear bombs and were less than a decade from Sputnik? I looked at the data that Wikipedia had and did a quick back-of-the-envelope estimate of Miranda's visual cross-section and calculated that it was around ~4/25 that of Umbriel's. That explains why it was discovered later than the other moons but why did it take almost a century when it would only have taken an increase of a telescopes diameter by 2.5 would have boosted light collection enough to make it as bright as the other moons seen with the smaller telescope. It isn't that dark, in fact its albedo seems relatively high so that isn't why we didn't find it. How did an entire moon nearly 500 km across manage to go unnoticed until the first half of the the 20th century was almost over? Edit:I just took another look at Miranda's Wikipedia page and it says that Miranda is the innermost of Uranus's five major moons. Was this part of why we didn't find it? Was it's light drowned out by Uranus's? [link] [comments]  |
| How do you break time reversal symmetry without breaking inversion symmetry? Posted: 19 Apr 2018 11:50 PM PDT I'm sorry I'm a little tipsy and do not understand magnetism. [link] [comments]  |
| Scientifically what makes a food burnt And at what state and why does burntness taste so distinct? Posted: 19 Apr 2018 05:11 PM PDT |
| Are there any stars that have multiple stars orbiting them? Posted: 19 Apr 2018 12:05 PM PDT I know that binary solar systems make up about half of the visible points of light in the galaxy, but those are orbiting each other. Do we know of any stars that have other stars orbiting them? Like, one really big or dense star with other, smaller or less dense stars orbiting them? [link] [comments]  |
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