What is Physics and name of branches of Physics

Q.1: What is Physics? Write the name of branches of Physics and explain them?

Answer: PHYSICS:

Physics is defined as a science which deals with the interaction of matter and energy.

OR

It is the branch of science which deals with physical properties, behavior of matter and bodies. Now a days Physics deals with the production of energy and their mutual relationship.

Main Branches OF Physics:

Main branches of Physics are given below:

  • Mechanics:

It deals with the motion of objects with or without reference of force.

  • Electricity:

It is concerned with the phenomena and effects related to electric charges.

  • Electromagnetism:

It deals with observations, principles, laws and methods that relate electricity and magnetism.

  • Atomic Physics:

It is concerned with the structures and properties of atoms.

  • Solid State Physics:

It is concerned with the structure and properties of solid materials.

  • Nuclear Physics:

Nuclear physics deals with the structures, properties and reactions of the nuclei of Atoms.

  • Astrophysics:

It is concerned with the study of astronomical bodies.

OR

“A branch of physics in which we study the behavior ot heavenly bodies like the moon, stars, the sun and other planets”.

  • Bio-Physics:

It is concerned with the study of biological systems in the light of theories of physics.

  • Plasma Physics:

It is concerned with matter in its plasma phase. Plasma is a state of matter which

Consists of highly ionized atoms, bare nuclei (nuclei without electrons) and electrons.

Q.2: Write down the important role of physics in our daily life?

Answer: IMPORTANCE OF Physics IN Our DAILY LIFE:

The importance of Physics in our daily life is given below:

  • Automobile technology is based on the principles of thermodynamics.
  • Nuclear energy is used on a large scale to produce electric power.
  • Radar technology is based on the rules of Physics.
  • Lasers are widely used in medical science.
  • All the electrical devices which are used as home appliances are based on physics rules and laws.

Q.3: What is a scientific method? Write down the names of its steps?

Answer: SCIENTIFIC METHOD:

It is a specific method used to search truth and reality.

OR

“The method which helps to collect facts on the basis of observations and experiments is called scientific method”.

Steps Of Scientific Method:

The scientific method includes the following five steps.

  • Observation
  • Hypothesis
  • Theory
  • Experiment
  • Laws

Q.4: Define the steps of a scientific method?

Answer: Steps OF A SCIENTIFIC METHODS:

  • Observation:

The process of observing natural phenomenon with the help of five senses and the scientific equipment is called observation. Observations are taken very carefully. All possible information are gathered about a physical phenomenon under investigation

  • Hypothesis:

The explanation of observations and facts is called hypothesis. A hypothesis is a notion or guess of a scientist in which he tries to explain the phenomenon.

  • Theory:

If a hypothesis is accepted, it is called a theory. Scientist designs a theory on the basis of hypothesis and given an elaborated explanation about the phenomenon.

  • Experiment:

Scientists make experiment to test a theory. If theory is proved by experiment, it is regarded correct and accepted. If the theory is not proved by experiments, it is discarded.

  • Laws:
  • When a theory has been thoroughly checked under different situations and it gives the Same results then it becomes a law. The law explains the observations and the experiments about a physical phenomenon.

Q.5: What are the different theories of light?

Answer: THERE ARE FOLLOWING IMPORTANT THEORIES OF LIGHT AS:

Newton’s Particle Theory Or Corpuscular Theory:

Newton made a hypothesis about the nature of light. According to Newton’s theory, light consisted of very minute but high velocity particles which were supposed to be originated from a source of light (like the sun). These particles are called corpuscles. According to this theory, the particles of light are travelled very faster in a denser medium than rarer medium.

Huygens’s Wave Theory Of Light:

According to this theory, the particles are travelled through a medium which is called ether. The light particles are travelled faster in rarer medium than the denser medium.

Quantum Theory Of Light:

According to this theory, light has dual nature sometimes it behaves like a wave and sometime like a particle. It consists of packets of energy which are called photon.