CBSE > Class 11 > Physics | CBSE Board | Homework Help

Physical law. A physical law, scientific law, or a law of nature is a scientific generalization based on empirical observations of physical behavior. ... The production of a summary description of nature in the form of such laws is a fundamental aim of science.

2Thank You

ANSWER

Unification of forces?

Posted by Rishabh Rawat 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Rishi Seth 6 years, 3 months ago

Newton showed celestial and terrestrial domains under a common law of gravitation Moreover Orested and Faraday unified magnetic and electric phenomenon are inseparable Therefore joining one or more theories and domains we get great advantage in phy. This is called unification of forces

0Thank You

ANSWER

Fundamental forces in nature

Posted by Rishabh Rawat 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 6 years, 3 months ago

There are following four fundamental forces in nature:
(i) Gravitational forces, (ii) electromagnetic forces, (iii) strong forces or nuclear forces, (iv) weak forces. Some of the important features of these forces are discussed below:
(i) Gravitational forces : These are the forces of attraction between any two bodies in the universe separated by a definite distance.
(ii) Electromagnetic forces : They include the electrostatic and magnetic forces. The electrostatic forces are the forces between two static charges while magnetic forces are the forces between two
magnetic poles. The moving charges give rise to the magnetic forces. The combined action of these forces are called electromagnetic forces. Characteristics of electromagnetic forces :
(i) These forces are both attractive as well as repulsive.
(ii) They are central forces in nature.
(iii) They obey inverse square law.
(iv) They are conservative forces in nature.
(v) These forces are due to the exchange of particles known as photons which carry no charge and have zero rest mass.
(vi) They are 1036 times stronger as compared to
gravitational forces and 10u times stronger than the weak forces.

(iii) Strong forces : The particles inside the nucleus are charged particles (protons) and neutral particles (neutrons) which are bounded to each other by a strong interaction called nuclear force or strong force. Hence, they may be defined as the forces binding the nucleons (protons and neutrons) together in a nucleus. These are responsible for the stability of the atomic nucleus. These are of three types:
(i) n-n forces are the forces of attraction between two neutrons.
(ii) p-p forces are the forces of attraction between two protons.
(iii) n-p forces are the forces of the attraction between a proton and a neutron.
Characteristics of nuclear forces:
(i) They are basically attractive in nature and become repulsive when the distance between nucleons is less than 0.5 Fermi.
(ii) They obey inverse square law.

(iv) Weak forces : They are defined as the interactions which take place between elementary particles during radioactive decay of a radioactive substance. In p-decay the nucleus emits an electron and a particle called neutrino (which is uncharged). The interaction between the electron and the neutrino is known as weak interaction or weak forces. Characteristics of weak forces:
(i) These are the types of forces that we encounter in macroscopic world, while.
(ii) These are the types of forces that we encounter in
the microscopic world.

3Thank You

ANSWER

What is the difference between science and technology?

Posted by Rishabh Rawat 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Digvijaysingh Kushwah 6 years, 3 months ago

Science means deep understanding physics, chemistry etc.

0Thank You

ANSWER

Does physics is an exact science?

Posted by Rishabh Rawat 6 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Rishi Seth 6 years, 3 months ago

No nothing is exact u can say in science specially Chem. And phy. Because their are lot of assumptions that we make in n phy. And Chem. While solving the problem. If we see real life and connect it with phy. Then it would be very complicated so assumption are made

0Thank You

ANSWER

What is the scope of physics and excitement of physics?

Posted by Rishabh Rawat 6 years, 3 months ago

CBSE > Class 11 > Physics