If gravity causes time dilation, wouldn't deep gravity wells create their own red-shift? How do astronomers distinguish close massive objects from distant objects? |
- If gravity causes time dilation, wouldn't deep gravity wells create their own red-shift? How do astronomers distinguish close massive objects from distant objects?
- Do particles move in a solid? Do they oscillate or vibrate?
- If skin cells are one of the fastest replicating cells, how come moles, and birth marks don’t disappear over time?
- Do gravitational waves have frequencies?
- What determines how many energy levels an electron can be excited to in an atom?
- Can you make blackholes from electromagnetism? If so, why are there so many made from gravity since electromagnetism is so much stronger?
- Why are the coldest months of the year (typically Jan/feb) not also the month with the shortest days (dec)?
- Regarding thermionic emission... if you heat up any metal of any kind hot enough, does it always release electrons in to the air? for example if you heat a needle with a flame
- If a ship could travel at 99.9% of C, how long/far could it travel before returning to our galaxy would be impossible?
- Is the electrical component always in phase with the magnetic component in an EM wave?
- What would happen if you pointed a laser beam tangent to the event horizon of a black hole?
- When will the next conjunction of Saturn and the Sun take place?
- Is there a ratio between the weight of a submersible vehicle and the amount air needed inside to keep it afloat at different depths? Could I theoretically make a sub as large as I want as long as it could hold air?
- Does the holographic principle literally imply that if I give you all the information about the walls in my room, you would be able to deduce what's inside my room?
- Can other sources of light be concentrated through a magnifying glass to start a fire? Like the light from a flashlight, or from a full moon?
- How does escape velocity work?!?
- How tightly is DNA coiled?
- What decides the capacity of a battery?
- Different colors on a thin film are said to be caused by interference. Why do we not say that thin films simply reflects certain wavelengths?
| Posted: 12 Jan 2018 07:42 PM PST |
| Do particles move in a solid? Do they oscillate or vibrate? Posted: 13 Jan 2018 06:03 AM PST I've heard about movement of particles in a gas or a liquid, but what about a solid? [link] [comments]  |
| Posted: 12 Jan 2018 11:53 AM PST |
| Do gravitational waves have frequencies? Posted: 12 Jan 2018 05:56 PM PST I feel like the obvious answer is they do, but I don't know the answer. And if so, what determines their frequencies? Mass? How noticeable are these frequencies, and what would the frequency of a gravitational wave from the sun be compared to the black hole collision that LIGO observed? [link] [comments]  |
| What determines how many energy levels an electron can be excited to in an atom? Posted: 13 Jan 2018 06:15 AM PST So electrons exist in a natural or ground state in an atom. When a photon hits a valence electron, the photon is absorbed and the electron is either raised to a higher energy level equal to the amount of energy of the photon or ejected from the atom. What determines how many energy levels an electron can be raised to though before it is ejected? Will a H atom only have 7 energy levels and then any more energy it would be ejected from the atom while a Na atom may have 15 energy levels before being ejected? [link] [comments]  |
| Posted: 12 Jan 2018 03:16 PM PST |
| Posted: 12 Jan 2018 02:01 PM PST |
| Posted: 12 Jan 2018 05:10 PM PST |
| Posted: 12 Jan 2018 11:22 AM PST If a ship could travel at 99.9% of C, how long/far could we travel before returning to our galaxy would be impossible due to it having moved out of the ship's observable universe? Would the answer differ based on direction the ship travels? [link] [comments]  |
| Is the electrical component always in phase with the magnetic component in an EM wave? Posted: 12 Jan 2018 01:09 PM PST In an EM wave is the magnetic component always in phase with the electrical? Or can they be shifted 90°(not spacially but in phase) for example so that the electrical peaks when the magnetic is 0 and vice versa. And if for example its around the wavelength of a few meters, would the phase shift( if possible) impact how easily we can convert this signal to current in a wire with an antenna? [link] [comments]  |
| What would happen if you pointed a laser beam tangent to the event horizon of a black hole? Posted: 12 Jan 2018 12:55 PM PST I know that past the event horizon, light couldn't escape a black hole's gravity. By that logic, anything before the event horizon should allow light to escape and move out freely into space. But what happens if you theoretically shine a light (or fire a single photon) perfectly tangent to the event horizon? [link] [comments]  |
| When will the next conjunction of Saturn and the Sun take place? Posted: 12 Jan 2018 12:12 PM PST Does anyone know when Saturn and the Sun will be in conjunction? That is: I'm interested in knowing when the Sun will be exactly between Earth and Saturn, making the gas giant essentially invisible from Earth. Also, I'd like to know for how long this would last. Thanks in advance! [link] [comments]  |
| Posted: 12 Jan 2018 03:14 PM PST |
| Posted: 12 Jan 2018 06:26 AM PST |
| Posted: 12 Jan 2018 08:11 AM PST |
| How does escape velocity work?!? Posted: 12 Jan 2018 01:40 PM PST Escape velocity does not make any sense to me! In theory if an object leaves the surface of a mass/planet in an otherwise empty universe, without any extra purpolsion after, won't it eventually come back? Gravity is an acceleration which keeps shaving off the kinetic energy of the object, so no matter how far it goes at some point the velocity will turn around, right? The kinetic energy of the object can be depleted but the potential energy induced from gravity cant so how do they negate? And what does someone mean by "escaping" a gravitational field? No matter how far apart something if from a mass it will never escape its gravitational pull! My only theory to my conundrum is this. I know the "escape velocity" is calculated by using the potential energy calculated from the mass. Which means as your measurement of the mass becomes infinitely more precise the escape velocity becomes infinite, I think? This is my first post on reddit (so srry if it's confusing and long) as no matter where I looked I couldn't find anything that could answer my doubts. Thx in advance. [link] [comments]  |
| Posted: 12 Jan 2018 09:01 AM PST Our students were making models of DNA and we began wondering how quickly you actually see the spiral shape. How many pairs does it take for it to go completely around? [link] [comments]  |
| What decides the capacity of a battery? Posted: 12 Jan 2018 09:51 AM PST I was doing my daily pondering, and came across this question, which I'm quite interested to know the answer to. [link] [comments]  |
| Posted: 12 Jan 2018 07:31 AM PST Based on equations from interference by thin films we know that wavelengths that are present on top side are absent at the bottom. This result can be achieved by simply saying that thin films reflect certain wavelengths and transmit others. [link] [comments]  |
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