Nucleus Definition and 423 Threads

In a recent discussion in this thread I wrote: Using classical mechanics and electomagnetism, work out the speed that an electron would have to have in order to orbit a hydrogen nucleus at a distance of 10^-12 m: F_c = \frac{m_ev^2}{r} = \frac{kq_e^2}{r^2} v = \sqrt{\frac{kq_e^2}{mr}}...

Apart from inertia and a nucleus' "gravity" (I invisage it's like the planets revolving around the sun), are there any other factors that keep the electrons from being attracted to the protons and crushing into the nucleus?

Consider the ground state of the hydrogen atom. Estimate the correction \frac{\Delta E}{E_1s} caused by the finite size of the nucleus. Assume that it is a unifromly charged shell with radius b and the potential inside is given by \frac{-e^2}{4\pi \epsilon b} Calculate the first order...

I'm not sure if these are very clear questions, but here goes: 1. If a fairly large nucleus is set spinning, then it should generate a small magnetic dipole, right? I'm wondering, how would you calculate it's magnetic moment, using the properties of that particular nuclide (e.g. mass, charge...

For a ground state Hydrogen atomic system (1 electron and 1 proton - not molecular di-hydrogen), what energies are being exerted by the proton to hold that electron? Does TE = KE + PE apply?

What speed do subatomic particles travel around the nucleus? Do the speeds vary with different paricles, IE Electron, Proton, Neutron? Are the speeds differnet with its idenical positron? I do know that electrons and protons travel around the nuclueus at differnt speeds, this we call "heat"...

can someone help to differentiate all these terms nuclide nucleus nuclei

Can anyone explain to me why gravity would not be a significant force on the 'surface' of a proton or neutron? A quick calculation shows that the acceleration of a neutron toward another neutron or a proton separated by less than the radius of a neutron, is very large (compared to the radius of...

I read somewhere that one of the explanations for an electron not spiraling into the nucleus is due to the uncertainty principle. If an electron falls into the nucleus both its position and velocity will be certain. How is that possible? Does the nucleus have both certainty in position and...

OK having a slight problem finding the mass of the unknown nucleus. Any help rearranging to find this using Newton's Gravitational law. A hydrogen nucleus and a nucleus of an ‘unknown’ atom are stationary, 5.0 x 10 ^-10 m apart. The mass of the hydrogen nucleus is mh = 1.7 x 10 - 27kg and...

What holds the nucleus together?

Is it known what the salt conditions are like in the nucleus? For instance, in the cytoplasm [KCl]=100mM [NaCl]=10mM.. would this be very different in the nucleus? Which salts would be important in influencing protein/protein or protein/DNA interactions?

"completely stable nucleus" question The nucleus of a helium isotope contains 2 protons. I have just worked out the magnitudes of the electrostatic force and the gravitational attraction between the 2 protons. The question now reads "the nucleus is completely stable. Considering the...

If oppositely charged particles attract, then why do electrons orbit the nucleus and not stick to it as the nucleus is positively charged and the electrons being negatively charged?

Ok, the problem is: The nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons). (a) What is the force between the two alpha particles when they are...

A proton of mass m undergoes a head-on elastic collision with a stationary carbon nucleus of mass 12m. The velocity of the proton is 395 m/s in the positive x direction. The velocity of the center of mass of the system is 30.38 m/s. What is the velocity of the proton after the collision?

Can somebody tell me what is the angular velocity of an electron (more or less) around the nucleus. (it doesn't matter whether it's one in the most inner shell or the most outter, I just need an average value) thanks

What is the acceleration of a particle orbiting around a nucleus? v/(4(pi)) = a ? I cannot find this info... Will you help me? r = r0

I was wondering if I could get some guidance regarding the following question: "A radioactive nucleus, moving in a straight line, decays and emits an alpha particle. In the rest frame of the nucleus, the emitted particle moves with a velocity 6c/7, at an angle of 60 degrees to the direction...

Another way to think ... Dear reader, Now what i am writing suerly would look different from the reason give by physicists about black body absorbtion of light. Before i begin i would like to make certain things clear. 1) let's asume when more energy is given, the speed of electrons...

hello people. I am kind of stuck in this problem: electrons in the nucleus of an atom orbit around the nucleus and accelerate. They will also continously emit electromagnetic radiation and therefore they must lose energy to do so because of the conservation of energy. As a result, wouldn't...

Calculate the smallest allowed energy of an electron were trapped inside an atomic nucleus of diameter 1.4x10^-14 meters. Compare this number with the several MeV of energy binding protons and neutrons inside the nucleus. On this basis, should we expect to find electrons within the nucleus...

ive read the answer so many times, i just can't think of the reason now... since the protons are positive and the electrons are negatively charged, why don't the electrons simply fall into the nucleus?