Q.No.
22:- Which particle is the anti-particle of electron?
Ans:- Positron is
the anti-particle of electron.
Thursday, 17 January 2013
Q.No.21:- what happens if proton becomes unstable than neutron?
Q.No.21:- what
happens if proton becomes unstable than neutron?
Ans:- If proton
become unstable than neutron then the world would become a different place
because sun shines due as that depends upon the neutron decay and the hydrogen
does not exists and almost all the organic compounds does not form.
Q.No.20:- Why neutron are unstable than proton?
Q.No.20:- Why
neutron are unstable than proton?
Ans:- Because
neutron has two down quarks and one up quark and down quark is more massive
means higher energy than up quark that’s why neutron is unstable than proton
because proton has one down and two up quark and have low energy than neutron.
Sunday, 23 September 2012
Why all bodies emit electromagnetic radiation?
Q.No.19: - Why all bodies emit electromagnetic radiation?
Ans: - Because of
thermal motion of their molecules all bodies emit radiation called thermal
radiation. Molecules are often neutral but their constituent particles like
electron and protons are charged particles when molecules vibrate their atoms
as a whole move and result in thermal radiation.
What are the fundamental source of electromagnetic radiation?
Q.No.18: - What
are the fundamental source of electromagnetic radiation?
What is the difference between proton and Δ+ particle?
Q.No.17: - What is the difference between proton and Δ+ particle?
Ans: - Proton and
Δ+ particles have same quark configuration. But there is only difference of
spin of quark e.g;
What is the internal structure of proton and neutron. Also show their charge by using quark charges.
Q.No.16: - What is
the internal structure of proton and neutron. Also show their charge by using
quark charges.
Ans: -
Proton P(uud) = 2/3 + 2/3 – 1/3 = +1
Neutron
N(ddu) = -1/3 – 1/3 + 2/3 =0
Friday, 21 September 2012
What is the numerical value of charge energy and spin of up and down quark.
Q.No.15: - What is the numerical value of
charge energy and spin of up and down quark.
Ans: - For up
quark
Spin = 1/2
; charge =
+2/3 energy (Mc² in MeV) ≈ 4 MeV
For down quark
Spin =
1/2 ; charge
= -1/3 energy (Mc² in MeV) ≈ 5
MeV
How γ-rays emit from nuclei?
Q.No.14: - How γ-rays emit from nuclei?
Ans: - In the case
of proton, as it is hit with ever higher energies, its quarks are elevated to
higher levels, and short-lived resonances are seen. This energy is rapidly
released by emitting photons. The excited levels are short lived and excess
energy, typically by radiating energy in the form of gamma-ray photons, and
fall back to the ground state (proton or neutron).
What is the value of neutron magnetic moment?
Q.No.13: - What is
the value of neutron magnetic moment?
Ans: - The
z-component of spin magnetic moment is
Saturday, 8 September 2012
As neutron is charge less particle then its magnetic moment well be zero or not?
Q.No.12: - As neutron is charge less particle then its magnetic moment will be zero or not?
Ans: - Although the electric charges of the quarks that form a neutron add up to zero but their individual magnetism does not cancel out which leads to the magnetic moment of neutron.
Which thing specifies the size of neutrons, protons and atom?
Q.No.11: - Which thing specifies the size of neutrons, protons and atom?
Ans: - It is the motion of these quarks that gives size of proton and neutron. The motion of electron determines the size of atoms.
In nucleons which particle is more massive and why?
Q.No.10: - In nucleons which particle is more massive and why?
Ans: - Neutron is more massive than proton because down quark is more massive than up quark and neutron contain 2 down quark and 1 up quark while in proton 1 down and 2 up quarks.
What are the mediators (field particles) of the basic forces?
Q.No.9: - What are the mediators (field particles) of the basic forces?
and
Enlist the fundamental four forces.
Q.No.8: - Enlist the fundamental four forces.
Ans: - (1) Electromagnetic force (2) Gravitational force (3) Weak force (4) Strong Force