Q.No.109(a): - Which condition of material, refractive index, wave speed and wavelength must satisfy for total internal reflection?

Q.No.109(a): -  Which condition of material, refractive index, wave speed and wavelength must satisfy for total internal reflection?

Ans: - When a ray passes from two media of different refractive index. Then the medium of incoming ray must have greater refractive index than the other i.e. the medium must be denser of incoming ray. Similarly the wave speed and wavelength of incoming ray must be smaller or shorter. Furthermore total internal reflection will occur if the angle of incident is larger than or equal to critical angle.

Q.No.43: - Can a photon interact with a charge less particle?

Q.No.43: - Can a photon interact with a charge less particle?

Ans: - No, a photon can’t interact with a charge less particle it interact only with charged particle.

Q.No.42: - Why the photon couple stronger with the up quark than the down quark?

Q.No.42: - Why the photon couple stronger with the up quark than the down quark?

Ans: - The coupling strength of photon increases with the magnitude of charge and the charge on the up quark is greater than that of down quark so photon couples stronger with the up quark than that the down quark.

Q.No.41: - Is the photon interacts with other particle? As it is a mass less and charge less particle.

Q.No.41: - Is the photon interacts with other particle? As it is a mass less and charge less particle.

Ans: - Yes, the photon interact with other charged particles with a strength increases with the charge of the particle even it is mass less and charge less particle.

Q.No.31: - What is the role of photon?

Q.No.31: - What is the role of photon?

Ans: - Photon is responsible for the electrostatic force between the electron and protons. These are called mediators. When electrostatic force exert on electron and proton then basically they are exchanging photons. We can say that photon carry electric charge. Photons couple electric charges.

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.

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

                           

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.

What are the mediators (field particles) of the basic forces?

Q.No.9: - What are the mediators (field particles) of the basic forces?

 Ans: - Photon of Electromagnetic force; Graviton of gravitational force; gluon of strong force; and  of weak force.

   

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