Alpha Definition and 460 Threads

A new analysis suggests that the orbit of the possible planet around Alpha Centauri B is oriented in such a way that the planet is only 1 to 3 times as massive as Earth. Link: Science.

Homework Statement How close does the alpha particle gets to the nucleus in gold foil scatering experiment?Homework Equations Ek = 2.0 MeV W=F delta x F=(kq1q2)/r^2 W=(kq1q2)/r E=W=(kq1q2)/r The Attempt at a Solution E= (k(79)(2) e^2)/r 2.0MeV= (k(158)e^2)/r 2,000,000 eV = 8.99 Wm^2 c^-2 ((158)...

Homework Statement An alpha particle with kinetic energy 15.0MeVmakes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude L=p0b, where p0 is the magnitude...

Homework Statement Four electrons are located at the corners of a square 10.0 nm on a side, with an alpha particle at its midpoint. How much work is needed to move the alpha particle to the midpoint of one of the sides of the square? Homework Equations W = PEo-PEf PE (if several point...

I was wondering if alpha particles created by radioactive decay ever have enough energy to fuse with something else (e.g. hydrogen or another alpha particle).

Define alpha_0 = 0, alpha_n+1 = aleph_alpha_n. Let alpha = sup{alpha_n : n is a natural number). Prove that alpha = aleph_alpha. My attempt: As alpha <= aleph_alpha is obvious, I've been trying to prove the other direction of inequality, so that being both <= and >= implies =, but now I'm not...

Is it worth it for a beginner to get a wolfram alpha pro acct? I'm interested in learning math and I find the free tools great. I'm curious as to how people that know how to do math think of wolfram. Do you think having the extended features would be too much for someone at a gr 12 u level...

Hi, I wanted to ionize hydrogen and helium to get protons and alpha particles. I then want to smash the protons into the alpha particles. Is it better to accelerate both the alpha particle and the proton or just keep the alpha particle as a target for the proton to hit? Or is there a better way...

Homework Statement Hey, first time poster here, I'm current writing up a lab report I just wanted to check my method is correct. I'm doing alpha particle spectroscopy using a cloud chamber setup. Most published reports seem to vary pressure (so the mass thickness varies). Our chamber let us...

Homework Statement calculate the mass of an unknown nucleus of mass M_X (initially at rest) if it it is hit by an alpha particle of mass m_xand is deflected by 40 degrees, and the alpha particle is deflected by an angle of 70 degrees. Assume elastic collisions [/B]Homework Equations...

Between 1909 and 1911 the current model of an atom was Thomson's plum pudding however this was disproved by Rutherford's experiment. So the question is, if Thomson's model was true what would of happened when the alpha particles was aimed at the gold foil?

Homework Statement Explain why stage 1 and 2 of the triple alpha process will not being until the core Temp of the star is around 10^8K. Homework Equations 4He+4He = 8Be (step 1) 8Be+4He = 12C (Step 2) The Attempt at a Solution I "think" I need to work out the nuclear energies... However I...

Homework Statement Use the periodic table to find the daughter nucleus after a gold nucleus (Au) undergoes beta decay. What would be the result if the gold nucleus had undergone alpha decay instead? Homework EquationsThe Attempt at a Solution Beta Decay: A=196.96655 Z=80 Au Alpha Decay...

What is supposed to be the lifetime of lead against alpha decay? Notable light isotopes that DO undergo alpha decay: Be-8 188 keV 7*10ˇ-16 s Sm-146 2529 keV 103*10ˇ6 y U-235 4679 keV 704*10ˇ6 y U-238 4270 keV 4,47*10ˇ9 y Th-232 4083 keV 14,06*10ˇ9 y Sm-147 2310 keV 106,1*10ˇ9 y Pt-190 3252 keV...

i'm struggling to understand this: an alpha particle is emitted with a kenetic energy T, if we know the value of the depth of the nuclear potential well V, we find the kenetic energy of the alpha particle inside the nuclei by substructing V-T , would you please explain this to me? Thank's

Alpha particle emits when no. of neutrons in an atom are much more... My ques. Is that the no. Of protons and neutrons emitted are same so the substance formed after the reaction should still have much more neutrons than protons.. Infact mathematically the ratio increases.

Homework Statement When a 7 3 Li nucleus is bombarded with protons α particles emerge.Calculate the kinetic energy of the alpha particle assuming the kinetic energy of the bombarding proton to be negligible. Given M (7 3 Li)=7.016004a.m.u. M (p)=1.007826a.m.u and M (α)=4.002603a.m.u. Homework...

Hi everyone I have a question and that question is" are alpha and beta and also gamma rays behavior is similar to a wave ?" For example if we set up an experiment as same as Young's interference experiment, are these rays acting as same as light in this experiment. Thanks

Homework Statement The nuclear masses of parent and daughter nuclei are Mp= 226.025 amu and Md=222.017 amu.Mass of alpha particle is Mα=4.002amu.Find qvalue and kinetic energy of alpha particle emitted for the alpha decay. Homework Equations Q=(Mp -Md-Mα)amu...1 Assuming nucleus to be at rest...

Homework Statement An alpha particle (the nucleus of a helium atom) is at rest at the origin of a Cartesian coordinate system. A proton is moving with a velocity of v towards the alpha particle in the xˆ direction. If the proton is initially far enough away to have no potential energy, how...

Homework Statement http://puu.sh/bz0km/092f2d8781.png Homework Equations h^2/2ma^2 The Attempt at a Solution I've found the uncertainty of the kinetic energy through many means, and I'm confident that it's .052MeV. The easiest method that gave me this answer was: using...

So I have a mechanics question 2.65 of which I have deduced the following : x-Component of all forces F1 = 150 cos30 F2= 150 cos \alpha F3 = 150 cos(\alpha+50) y-Components of all forces F1 = -150 sin30 F2 = 150 sin \alpha F3 = 150 cos(50-\alpha) Finally, R = \sqrt{(\Sigma Fx)^2 + (\Sigma...

Alright if I have an object that's completely constituted of alpha radiation particles (emitting the +2 charge nucleus of a hydrogen atom), how would that be accurately detected taking into consideration that I don't have a Griegor Counter on hand? Americium-241

I don't know much thing about rays. When I was studying Rutherford experiment, I saw that nucleus scattered the alpha rays with Coulomb forces, and naturally the opposite forces effect the nucleus. So do the nucles of atom moves to the direction of alpha rays' first direction?

Homework Statement For the nuclear reaction, 1 neutron (1/0n) + 10/5B → 7/3L + 4/2He (alpha particle) assume that the initial kinetic energy and momentum of the reacting particles are negligible. Calculate the speed of the alpha particle immediately after it leaves the reaction. Homework...

The following passage has been extracted from the book "Modern's abc of Chemistry": Lets fill an isolated atom by subatomic "Rutherford projectiles"-alpha particles. I hope it is possible. This doesn't seem to be a limit of our technology. Isn't it? If we are successful in...

I have three questions about ICF, in the explanations i have read on the internet about ICF they all explain that the top layer of the pellet or the ablator is heated till it explodes and produces a reaction force which compress the D+T fuel. They then say shock waves are formed due to the...

An alpha particle is thrown toward a gold nucleus. An alpha particle has two neutrons and two protons and a load module 2e, where "e" is the electron charge, while the gold nucleus has 79 protons and a load module 79e. What is the minimum kinetic energy that the alpha particle must have in order...

Homework Statement Assuming we know the length of the string L, radius of the swept out circle r, angle formed by string and centre of circle, \theta, and angle the swept out circle is to the horizontal, \alpha, what is the speed, v, of the mass if it is constant? picture...

Homework Statement On the diagram below, draw vectors to show the magnitude and direction of the electric forces acting between an alpha particle and an electron. (++) (-) (I can do that bit) Hence state and explain which of the two particles will experience great acceleration...

1. Is there any way to prove that the alpha particle is a boson (its total wave function is symmetric), given that it's made up of two protons (fermions) and two neutrons (fermions)? Homework Equations The total wave function for two identical particles that are (bosons) ψ_tot = 1/√2 * (ψ_a...

Homework Statement Homework Equations r=mv/qb mv=sqrt(2*KE*m(alpha)) m(alpha)=6.64e-27 kg The Attempt at a Solution i was just wondering how to get the answer (7.6e-4 m). i get path curving down, and do r=sqrt(2*1e3eV*6.64e-27kg*1.6e-19J/eV)/(q*B) =15.18e-4m so to get the...

[Mentor's note: this thread does not use the standard homework-help template, because it was started in one of the non-homework forums. It was moved here because it had already gotten some help.] Hi everyone. This isn't a homework question, as I am just revising notes for my exams, and after...

All nuclei with A > 210 are alpha emitters, yet very few emit protons spontaneously. Yet both decays lower the Coulomb energy of the nucleus. Why is proton decay not more common?

Hi, i am new here. Thought it would be good to sign up as i have just started hitting the books in preparation for my AS Level exams. So this is my first question. I think i may have done this question correctly, but i was just seeing what other people think as i am not 100% sure about it...

Hello all you physics folks, this is my first post, so if I screw this up, go easy on me :) Here's the problem I'm working on and that I simply can't get my head wrapped around: I have a table of 10 values of counts per second (cps) of alpha decay of Americium-241, depending on the...

Homework Statement From Bohr’s model of hydrogen atom, derive the ratio of the electron velocity in the ground state of hydrogen atom to the speed of light, which is the fine structure constant α, in terms of fundamental physical constants such as h, m, and c. Homework Equations...

Thank you for any help that you can offer. Did I answer the questions? Homework Statement What is the minimum value of Beta which would cause a source? current source? https://scontent-a.xx.fbcdn.net/hphotos-prn1/t1.0-9/1959374_10151945917195919_465523700_n.jpg Homework Equations Beta =...

Hey guys, I am having a hard time solving for this problem, and I can't seem to figure out what I am doing wrong. Homework Statement In the form of radioactive decay known as alpha decay, an unstable nucleus emits a helium-atom nucleus, which is called an alpha particle. An alpha particle...

Suppose the clean water of a stream flows into Lake Alpha, then into Lake Beta, and then further downstream. The in and out flow for each lake is 500 liters per hour. Lake Alpha contains 400 thousand liters of water, and Lake Beta contains 200 thousand liters of water. A truck with 200 kilograms...

As a radioactive sample decays in a glass vacuum container, and the released alpha particles collide with the glass, would it be correct to assume that the particles "bounce around?"

does fusion nuclear reaction produce alpha and jamma ridation or just alpha

I have been stuck on the following double integral for some time: ∫(0 to inf) dα1 ∫(0 to inf) dα2 a1^(n1) * exp(-i (α1+α2) m^2) * (α1+α2)^(n2) which arose after using alpha paremetrization on a Feynman integral. I was advised by my supervisor to use the substitution α1 = 1/2 (t+u) and α2 = 1/2...

Hi there, When an alpha particle is formed inside a nucleus by binding together is this essentially nuclear fusion occurring? Why is this more likely to happen in a large nucleus than a small one? Thanks

Homework Statement Consider two projectiles launched on level ground with the same speed, at angles 45°\pm \alpha. Show that the ratio of their flight times is tan 45°\pm \alpha. The Attempt at a Solution projectile 1 launched at Θ = 45° + \alpha: vyf1 = vyi1 + gt tapex1 =...

Homework Statement An alpha particle (4 times the mass of a proton with a charge of +2e) is at rest 1.0 * 10^-12 m from a stationary proton. The 2 particles immediately move apart. Find the speed of each particle when they are infinitely far from each other. Homework Equations...

I am wondering how one would go about drawing graphs in Argand plane using Wolfram Alpha. For instance, I want to plot an ellipse $|z-1|+|z+1|=5$ using W|A, what should be the input? Simply entering $|z-1|+|z+1|=5$ doesn't give what I want. Thanks!

So yeah, Just using wolfram to help draw a nice function, when this happens: http://www.wolframalpha.com/input/?i=x%5E2%2Fln(x) It shows a real part under zero, when the function given, x^2/ln(x) has no real solution under zero ! It's domain being: Dm(f) = ]0;1[U]1;infinity[ need...

Homework Statement Suppose a sample of size 10 is drawn from a distribution with probability density function ##f(x, \theta) = 2x^{\theta}(1-x)^{1-\theta}## if ##0<x<1## and ##0## otherwise, where ##\theta \in \{0,1\}##. Describe a best critical region of size ##\alpha## for testing ##H_0 ...

Homework Statement could you help me for the question b? Homework Equations E = mc^2 The Attempt at a Solution the mass of the alpha particle is 0.66466 x 10^-26 kg >> 4.022 u put it into the equation, so E = 4.022 x c x c = 3.615 x 10^17 eV >> 0.0579 joule my answer is that, but my...