Questions received via “Ask a Question” section
How to make a radio? Asked Amritansh prasad
How many time constant will be elapsed before the power delivered to the battery drops to half of its maximum value? Asked Mrityunjoy
Nucleus of an atom consists of neutral neutrons and positively charged protrons… then why do protons not attract neutrons and share charges with them? (+ve charges are supposed to attract neutral & -ve charges,aren’t they? and once they are in contact they share charges!) Asked sree
English: Schematic representation of a nucleus as an ensemble of neutrons and protons (Photo credit: Wikipedia)
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Categories: Plus Two Physics Tags: acceleration, atom, Atomic nucleus, Business, Central Board of Secondary Education, earth, Electric charge, Electronics and Electrical, neutron, Physic, Projectile motion, proton, Subatomic particle, technology, time travel
Collection of Problems received from Class 12 Physics
These problems were posted by Geena. Hope that we will be able to post the answers to these questions soon; each in a separate post. By the time visitors can attempt to post their answers as comments to this post. (Only selected posts will be published) Please note that the answers are not published until the [...]
Categories: Ask Physics, charge density, Electromagnetism, Interesting Questions, potential drop, Project, time answers Tags: ammeter, AskPhysics, cell, charge density, internal resistance, Physics, physics teachers, post, potential drop, problem, proton, question, time answers, wire
Why protons attract inside a nucleus?
What is the reason for proton- proton attraction inside the nucleus according to nuclear physics? (Sanjeev Asked)
Answer: Inside the nucleus where the nucleons are very close to each other, the force which holds them together is the nuclear force, which is the strongest force in nature. The electrostatic force between protons is negligibly small compared to the nuclear force. But the nuclear force is of a very short range, 10^-15 m.
The nuclear force is charge independent, i.e; the nuclear force between proton and proton, proton and neutron as well as neutron and neutron are almost the same.
Yukawa’s meson theory suggest that the nuclear force is an exchange force. The nucleons are bound because of constant exchange of the mesons.
The nuclear force is only felt among hadrons. At small separations between nucleons (less than ~ 0.7 fm between their centers) the force becomes repulsive, which keeps the nucleons at a certain average separation, even if they are of different types. At distances larger than 0.7 femtometer (fm) the force becomes attractive between spin-aligned nucleons, becoming maximal at a center-center distance of about 0.9 fm. Beyond this distance the force drops essentially exponentially, until beyond about 2.0 fm separation, the force drops to negligibly small values.
At short distances (less than 1.7 fm or so), the nuclear force is stronger than the Coulomb force between protons; it thus overcomes the repulsion of protons inside the nucleus.
However, the Coulomb force between protons has a much larger range due to its decay as the inverse square of charge separation, and Coulomb repulsion thus becomes the only significant force between protons when their separation exceeds about 2 to 2.5 fm.
(There are many terms introduced in the explanation. You can discuss them as comments for obtaining further details, if required)
Reference:
Categories: +2 Physics, Answers, ANSWERS TO QUESTIONS FROM VISITORS, Chemistry, interesting question, Interesting Questions, Nuclear Physics Tags: answer, attraction, coulomb, coulomb force, coulomb repulsion, femtometer, Force, meson, meson theory, nuclear force, nucleus, Physics, proton, range, reason
How atoms are formed? – Neeraj Asks
Neeraj asks: ”We have read that atoms can neither been created nor been destroyed!I want to know from where atoms came in existence,if they can not been created,also atom contain electron and proton which are negatively and positively charged,i want to know from where these charge came?” Your question will be answered soon Link to this post!
Categories: Answers, Ask Physics, ELECTROSTATICS, Interesting Questions, neeraj, Project Tags: atom, atoms, charge, electron, existence, link, Physics, post, proton, question
How atoms are formed? – Neeraj Asks
Neeraj asks: ”We have read that atoms can neither been created nor been destroyed!I want to know from where atoms came in existence,if they can not been created,also atom contain electron and proton which are negatively and positively charged,i want to know from where these charge came?” Your question will be answered soon Link to this post!
Categories: Answers, Ask Physics, ELECTROSTATICS, Interesting Questions, neeraj, Project Tags: atom, atoms, charge, electron, existence, link, Physics, post, proton
How does the proton get its spin?
At a meeting this week of the American Physical Society in Washington, MIT Associate Professor of Physics Bernd Surrow reported on new results from the STAR experiment at the Relativistic Heavy Ion Collider (RHIC) that provide a better understanding of the internal structure of the proton, the basic building block of all nuclei.
The world’s only polarized proton collider, at Brookhaven National Laboratory in Upton, N.Y., RHIC is used by MIT physicists to understand how the proton gets its spin, a fundamental quantum mechanical property (spin manifests itself as an intrinsic magnetic field, a property that is the basis of magnetic resonance imaging, or MRI). In 2009, spin-polarized protons were collided in RHIC at a record high center-of-mass energy of 500 giga electron volts (GeV). At this high energy — an energy 250 times the mass of the two individual protons making the collision — the protons are moving essentially at the speed of light and the quarks inside the proton are able to “see” each other at a resolution that is very small compared to the size of the proton. This allows scientists to study the proton’s internal structure.
Read More at http://www.physorg.com/news185652383.html
Categories: Plus Two Physics Tags: Associate, electron volts, intrinsic magnetic field, magnetic resonance imaging, Physics, proton, proton collider, society, star experiment, structure
