Effects Definition and 963 Threads

"Electrons are accelerated by a potential of 350kV in an electron microscope. Calculate the de Broglie wavelength of those electrons taling relativistic effects into account" I attempted the following: W = W(kin) = 350keV now W(kin)= (1-gamma)mc^2 so, now one could solve for...

I'm a little confused about what happens when we connect two objects by a wire. Does this just equal the potentials, or does it equal the charges? Also, does this depend on the nature of the objects (is it different for e.g conductors or capacitors?) thanks for your help

What would be the change of the induced emf in the secondary coil of a two coil system ( without ferromagnetic core ) if both the amplitude and the frequency of the current in the primary coil would double?: emf would stay the same emf would be halved emf would be 4 times larger...

Hi all, I'm currently taking a course in introductory cosmology, last quarter I had an introductory course in plasma physics. Something that's been bothering me through the course of my cosmo class is the fact that plasma effects are entirely ignored even though it's acknowledged that, for...

The conductivity of pure germanium increases by 50% when the temperature is increased from 20 degree C to 30 degree C. What is the energy gap E_g between the conduction and the valence bands of germanium? b) For silicon E_g = 1.1eV, what is the percentage change in the conductivity for the...

its a drug. what is it perscribed for. and what are the effects.

If I am to understand correctly, light speed is the speed at which light travels through space. As I also am led to believe, our sun is some four lightyears away. I recall hearing that since it takes roughly four years for light to travel from the sun to us, the light we see during the day...

can anyone tell me what parts of the digestive secretion have high basic pHs of 8-9.0...and they gradually increase in effectiveness for certain jobs

I asked why a bomb going off on one side of a mountain would seemingly affect gravity for people on the other side of the mountain about a year ago. Experienced in Nam with valley floors about 2 miles apart. That's a lot of rock and soil seperating those who experienced this from the explosion...

What are the possible effects of pressure changes of the surrounding gas during crystallization. Can such changes be detected on the resulting crystal.

i am trying to simulate the spiralling motion of a coin that is rolled on a table.i am having three equations... 1. the gyroscopic moment equation. 2. the conservation of energy equation. 3. general kinematic equation. three unknowns...curvature radius,precession velocity and coin...

I did look through this forum for other threads on this topic, but didn't find any. If this has already been discussed, then please let me know where the thread is. A common model for the expanding universe is an expanding balloon upon which some dots have been drawn. A well know flaw in this...

Di-hydrogen monoxide (DHMO) was an excellent joke of a student, showing how easy people can be fooled/conned when appealing to their noble instincts - safety, protection, defence. Of course we have to protect the world, and when there is any acute danger, we must act. Apparently, we need that...

Hi there. i need some help from you guys can any of you tell me how to prove the effects of negative feedback mathematically? i need to prove that negative feedback causes -reduction in gain -reduction of distortion -increase of gain stability -increase in bandwidth increase in input...

This is an analysis involving general relativity (GR). Let a spherically symmetric, uncharged, nonrotating star (not a black hole—that comes later) have an escape velocity = infinitesimally less than c at its surface. Then its r-coordinate radius (also known as the reduced circumference and...

How loud does brown noise have to be for it to be effective?

On my browser, faster posts now have less length on the x-axis, <---->. Is this the same in your inertial frame?

Can anyone point me toward a good resource that relates the effects of radiation on materials? I had asked my material science professor about it, but it seems we do not cover it in this introductory class. This class is the only material science class I have to take, and I want to learn more.

Do We Observe Quantum Gravity Effects at Galactic Scales? http://www.arxiv.org/abs/astro-ph/0509163 Do we Observe Quantum Gravity Effects at Galactic Scales? M. Reuter, H. Weyer 6 pages, 1 figure. Talk given by M.R. at the 21st IAP meeting "Mass Profiles and Shapes of Cosmological...

NOT homework, just curious :redface: (*Let's say we have some healthy albeit imaginary black plants :smile:) :eek: Would "black plants" pose a strict threat to the population of our currently flora (which happens to be green) ? By "black plants" => photosynthetically-superior to green...

Hey I went through some traumatic experiences (High school + Family probelms etc) and I think that they caused some problems like...I have a much higher amount of ADD, OCD, Anxiety, Paranoia, that I ever had before high school..I also think I have some memory problems involving the period of...

What would be the effects of Earth not having a moon? I know that our moon is slowly drifting away. But what would happen then?

Hi there, I am currently learning about the quantum hall effect and am a bit confused about the edge states picture and how this fits in with the rest of the theory. In most books/review texts the theory is dicussed from the point of view of an infinite 2D system the magneteic field collapses...

I know hair grows from skin, and about 0.5-1.5 inchs long. do u no any way to stop hair growning. any way that is not harmfull or has side effects now and forever. -------------------- Ok, truthly, I have lot os hair on my body, and it seems like growing more and more. I just want to waer...

Experiment to show how algal growth effects plants

I have to write a short essay answering this question (1st year university level). I am finding it very hard to get any decent info on the net at all. If someone could help me out with this I would be very appreciative. Thanks. Regards Graeme

I was wondering exactly how yield and tensile strength increases with increasing levels of strain rate for a typical steel grade? I understand dislocations are generated during straining (work hardening), but what happens at higher strain rates which increases the strength?

I have some questions here about Benzene. So the presence of one substituent in a benzene ring will affect the ease and position of any further substituent group, such like -CH_3,NO_2,Cl. And it's known that the Ortho,para-directing groups or electron donating groups are ring activating...

If the propeller is placed in front of wings and since the job of the propeller is to accelerate the airflow, wouldn't it result in faster airflow around the wing resulting in increased lift?

If a distant object is viewed through a small ciruclar aperture that is placed close to the eye, there is an apparent "shadowing" of the center of the viewed image, while the inner perimeter of the aperture is bright. The small aperture enhances the depth of field for good focus, but the...

is it true that the Earth's magnetic field is changing so that magnetic north will be directional south and vice versa. and if so how is it doing it

I am trying to start a discussion on the Effects of EM on matter (biological, electronic and other matter). I am trying to understand the relationship between quantities Electromagnetic (EM) and effects on matter. In particular many types of EM used for medical purposes and can reach certain...

If a hollow disk of say radius R is heated which causes it to expand a bit and a solid disk of radius slightly greater than R is fixed inside it after which both cool down, the solid disk will be in compression and the hollow disk in tension right? Now if this disk is rotated at a some speed...

What would be the effect of an increase in temp on the rate constant of a) the forward reaction b) reverse reaction and my second Q is..why is it important to specify the temp when giving a value for Ke? Thanks

I have a test tomorrow and I'm stuck on what to do with this question. If someone could help me I would greatly appreciate it. I'm completely lost on this: A thin layer of glass (n = 1.50) floats on a transparent liquid (n = 1.35). The glass is illuminated from above by light with a...

there's a new 3 page paper by Carlo Rovelli and Alejandro Perez http://arxiv.org/abs/gr-qc/0505081 Physical effects of the Immirzi parameter "The Immirzi parameter is a constant appearing in the version of the general relativity action utilized as a starting point for the loop quantization...

can anyone tell me what ll be the effect change of acceleration on ceramic products...

Under what conditions will quantum effects become important for gravity?

If a black hole creates a dent in spactime, would a white hole creat a lump, and if it did would it be in the future?

If I compress air in 1/2 of the original volume the ideal gas equation predicts either 1-pressure remains the same temperature doubles 2-temperature remains the same pressure doubles My questions is..what would I really observe during the compression..a increase in temp, increase in pressure...

Can anybody direct me to a discussion on the effects of a sudden reduction of the Earth's gravity - say by 50%? Purely speculative, of course. I'm assuming its orbit around the sun would be essentially unchanged, but that the moon would recede or maybe head off on its own merry way. Any other...

Could someone explain to me how solar flares occur? How do high incidence of solar flares on the sun's surface affect the Earth? I know tele-communications are affected during a solar storm. What are the possible consequences if the frequency of such solar winds are high? Also, any useful...

So what causes the moon to be orange? I saw one such display about an hour ago going to get food and i was like "aww... big cheese wheel... I am going to eat the moon". So what cuases that?

http://www.nature.com/news/2005/050314/full/050314-13.html Who are you going go listen to when everything is at stake?

1] Two long straight parallel conductors each carrying a current of 24 amps flowing in the same direction are fixed at a distance of 40mm from each other. A third parallel conductor is placed equidistant from the other two and carries a current of 30 amps. Show that the force on the third...

1) Nonpolar liquids are dangerous? How? What are some harmful nonpolar substances--how is nonpolarity harmful? I mean, why exactly? 2) Is it true that pure distilled water is harmful to drink? I mean pure, without impurities--just pure H2O; it seems safe, but is it really harmful? What will...

I've been working on/off with problems of environmentally assisted cracking, primarily in the fracture mechanics side of things and on occation some damage mechanics work. As a continuation for this I started looking for plasticity models which introduce the effects of hydrogen directly into...

How come the Earth is negatively charged?

I am doing an investigation on: comparing effects of antibiotics on Gram +ve and -ve bacteria. I have used 8 antibiotics and I have measured the diameter of killing zones. I am a bit unsure of how to carry out the analysis. I will be using Mann Whitney U Test, but what about graphical...

Hello, I've been pondering the implications of SR in media other than pure vacuum (yes, yes I know such a thing doesn't exist :). More specifically relating to the following thought experiment. If we have a prism of length L in the path of a light source, with a wall @ the other end (the...