Friday 13 November 2015
Thursday 15 October 2015
Class 11 Physics Ncert Solutions Free Download
CHAPTER 2 - Units and Measurements
CHAPTER 3 - Motion in a Straight line
CHAPTER 4 - Motion in a Plan
CHAPTER 5 - Laws of motion
CHAPTER 6 - Work Energy and power
CHAPTER 7 - System of particles and Rotational Motion
CHAPTER 8 - Gravitation
CHAPTER 9 - Mechanical Properties of Solids
CHAPTER 10- Mechanical Properties of Fluids
CHAPTER 11- Thermal properties of solids
CHAPTER 12- Thermodynamics
CHAPTER 13- Kinetic Theory
CHAPTER 14- oscillations
CHAPTER 15- Waves
Tuesday 8 September 2015
PHYSICAL WORLD
Physical
world
1.1
what is Physics?
Science is a study of nature, in nature there
are changes some of the changes are permanent and some or temporarily.
Permanent change is also called chemical change, and temperature changes are
called physical changes. In Physics we deal with temporary changes in nature.
Science is exploring one ,the scientist do experiments and predictions to develop theories.
1.2
scope and excitement of Physics
The scope of Physics can be understood by
examining its various branches. In broadly
there are three domains
1.
Macroscopic domain
Macro means something big in size .
Macroscopic domain includes phenomena in Terrestrial and astronomical scales. Terrestrial means
the things we see around us. For example human beings animals buildings trees
etc. Almost everything that visible to us, which we can see with naked eye call
terrestrial. Astronomical means, Sun and planets extra.
2.
Microscopic domain
The term micro means something very small in
size. The microscopic domain includes molecular, atomic and nuclear phenomenon.
3.
Mesoscopic domain
The term
Meso means something in between
macro and micro. Which deals with few
tens or hundreds of atom.
Let’s have a quick comparison between all the
threes
Anything we see around us is called matter,
which is made with molecules and molecules are made with atoms finally atom
consists of nucleus and electrons
Excitement of Physics
Let's see what makes physics an exciting
subject.
1. Carrying
out interesting experiments in lab,
2.
Discovering secrets of nature
3. Applying
laws of Physics in practical life
1.3 physics, technology and Society
Sometimes physics generate new technology and
other Times Technology will give rise to new physics, both have impact on
society.
For example heat engine, which was discovered in
1700 after this heat engine was discovered the scientist studied the principles
and the reasons which makes the heat engine works. And finally they discovered
a complete discipline of thermodynamics. Which means the scientist discovered
heat engine first and then they discover the principle behind it.
Similarly some other Times physics come first
and then it gives rise to new technology. For example the IC chip in our
computers, this came into picture due to the rise of new technology that will
study in our plus two classes. IC chips are formed from semiconductor physics.
This means theory of semiconductor physics which gives rise to IC chips.
Here Physics come first after leads to technology.
1.4 Fundamental forces of nature
Force is a push or pull that can cause an
object to change its velocity of shape. There are four fundamental forces in
nature they are gravitational force, electromagnetic force, strong nuclear
force and weak nuclear force
1.4 .1 Gravitational force
Gravitational
force is a Universal force, which does always an attractive force exist between
any two bodies in this universe. Gravitational force depends on masses and the
distance separated by the masses. Gravitational force is the weakest force in
the nature and it is also the longest range force.
• It is always attractive.
• It operates in all objects of universe.
• Its range is infinite
1.4.2
Electromagnetic force
As the name suggests electro-magnetic, it is
the force between charged particles it can be attractive or repulsive. a charged particle in rest can produce electric field ,but a moving
charge can produce both electric and magnetic field. The forces due to electric
and magnetic field on a charged particle are called electromagnetic force.
• It’s due to stationery or
moving Electrical charge
• It may be
attractive or repulsive.
• It operates
on charged particles
• Its range
is infinite
• Its
stronger 1036 times than gravitational force but 10-2
times of strong Nuclear force.
1.4 .3 Strong nuclear force
The strong nuclear force binds the nucleons
(protons and neutrons) inside the nucleus. It is the strongest force in nature,
but the range of nuclear force is very small. The strong nuclear force is
independent of charge.
• Operate between Nucleons
• It may be attractive or repulsive
• Its range is very short, within nuclear
size
• Its strongest force in nature
1.4.4 Weak
nuclear force
The weak
force, or weak interaction, is stronger than gravity, but it is only effective
at very short distances. It acts on the subatomic level and plays a crucial
role in powering stars and creating elements.
• Operate
within nucleons I.e. elementary particles like electron and neutrino.
• It appears
during radioactive beta decay.
• Has very
short range 10-15m.
• 10-13
times than Strong nuclear force.
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