JEE 2021 Strategy | JEE Preparation | JEE Mains | JEE Advanced | Unacademy JEE | Sameer Chincholikar

Whether you are appearing for JEE 2021, or JEE 2022; you need a strategy to stay ahead of your competitors. In this session, Sameer Chincholikar Sir guides you on how to take on JEE 2021 and crack it with ease

Unacademy JEE is a free YouTube channel to help JEE aspirants in their preparation for JEE Mains and Advance 2021. The channel will guide you in making a strategy to decode the JEE question paper, revise every detail of all the subjects, and make a study plan that will help you prepare with confidence. Our Unacademy experts are committed to giving the best guidance for JEE 2021 preparations by analysing the crucial needs of the students who want to crack the entrance exam and get through IIT JEE.

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[tusharsaini]

Finally someone talking for 2021 aspirant 🙏🏻

[ayushisingh]

I m glad they chose Sameer Sir for this....

[ankitshrivastava]

Believe me guys he is the best i mean the best maths teacher on youtube

[Xcvbn]

20:19 most important part of this lecture...

That students need

[youjustwastedsecondsofyou]

Needed this session a lot sir ...thank you very much

[Sahil-uolu]

Best thought of best mentor
Know something about everything and everything about something

[rajadas]

Finally someone is there for 2021 asapirants...

[kostubhgarg]

My two fav maths teacher on youtube: Sameer Sir and Anup Sir

[vivekshah]

Can't digest that this video is literally 2 years old and when I was in 12th and preparing for jee 2021 and saw this video really time flies😔😭🥹 btw i got 97.27%ile thanks to samir sir❤️❤️

[belugacodes]

2020 Aspirants ko pura attention mil rha tha. Ab APNA TIME AA GAYA

[nilaykumarsingh]

When I was 2020 aspirant :
I watched strategy for 2019 aspirants
Also when I was 2020 aspirant :
I watched strategy for 2020 aspirants

As a result, now I am a 2021 aspirant

😂😂😂😂

[knony]

5:55 WHENEVER YOU FEEL DEMOTIVATED JUST CLICK THIS TIMESTAMP! THIS WILL MAKE YOU REALISE THE COMPETITION AND YOU'LL JUMP BACK TO THE SEAT!

ALL THE BEST EVERYONE!

[tejaschandelkar]

2021 aspirants be like :- 4 months me Kya Air 100 me a skte h

Sir Kya abhi start kiya to Top kr skte hai Kya 😂😂

2021 aspirants hit like

We meet in IIT DELHI..

[surajitmaity]

Finally, ,jee 2021 ...Thank you so much❤️❤️❤️

[marginpx]

STATES OF MATTER 149
The ratio between the three speeds is given
below :
ump
: uav
: urms
: : 1 : 1.128 : 1.224
5.8 KINETIC MOLECULAR THEORY OF
GASES
So far we have learnt the laws (e.g., Boyle’s law,
Charles’ law etc.) which are concise statements
of experimental facts observed in the laboratory
by the scientists. Conducting careful
experiments is an important aspect of scientific
method and it tells us how the particular
system is behaving under different conditions.
However, once the experimental facts are
established, a scientist is curious to know why
the system is behaving in that way. For
example, gas laws help us to predict that
pressure increases when we compress gases
but we would like to know what happens at
molecular level when a gas is compressed ? A
theory is constructed to answer such
questions. A theory is a model (i.e., a mental
picture) that enables us to better understand
our observations. The theory that attempts to
elucidate the behaviour of gases is known as
kinetic molecular theory.
Assumptions or postulates of the kinetic-
molecular theory of gases are given below.
These postulates are related to atoms and
molecules which cannot be seen, hence it is
said to provide a microscopic model of gases.
• Gases consist of large number of identical
particles (atoms or molecules) that are so
small and so far apart on the average that
the actual volume of the molecules is
negligible in comparison to the empty space
between them. They are considered as point
masses. This assumption explains the
great compressibility of gases.
• There is no force of attraction between the
particles of a gas at ordinary temperature and
pressure. The support for this assumption
comes from the fact that gases expand and
occupy all the space available to them.
• Particles of a gas are always in constant and
random motion. If the particles were at rest
and occupied fixed positions, then a gas would
have had a fixed shape which is not observed.
• Particles of a gas move in all possible
directions in straight lines. During their
random motion, they collide with each
other and with the walls of the container.
Pressure is exerted by the gas as a result
of collision of the particles with the walls of
the container.
• Collisions of gas molecules are perfectly
elastic. This means that total energy of
molecules before and after the collision
remains same. There may be exchange of
energy between colliding molecules, their
individual energies may change, but the
sum of their energies remains constant. If
there were loss of kinetic energy, the motion
of molecules will stop and gases will settle
down. This is contrary to what is actually
observed.
• At any particular time, different particles
in the gas have different speeds and hence
different kinetic energies. This assumption
is reasonable because as the particles
collide, we expect their speed to change.
Even if initial speed of all the particles was
same, the molecular collisions will disrupt
this uniformity. Consequently, the particles
must have different speeds, which go on
changing constantly. It is possible to show
that though the individual speeds are
changing, the distribution of speeds
remains constant at a particular
temperature.
• If a molecule has variable speed, then it
must have a variable kinetic energy. Under
these circumstances, we can talk only
about average kinetic energy. In kinetic
theory, it is assumed that average kinetic
energy of the gas molecules is directly
proportional to the absolute temperature.
It is seen that on heating a gas at constant
volume, the pressure increases. On heating
the gas, kinetic energy of the particles
increases and these strike the walls of the
container more frequently, thus, exerting
more pressure.
Kinetic theory of gases allows us to derive
theoretically, all the gas laws studied in the
previous sections. Calculations and predictions
2018-19

[debashispradhan]

Best math teacher I have ever seen. I am very lucky to listen to such an inspired teacher

[Furyplayzz]

How shy sameer sir is. ☺️.. 4, 000 bachhe h 4, 000 likes nhi. H.. Nd NAMO sir be like... 4, jud chuke... 4k likes nhi dikhre.. 5, 4, 3, 2, 1..amazing baccho amazing 🤣

[sovanroy]

You are my favorite maths teacher forever

[mehulyadav]

I literally forgot we have only 3 months

[hemantsaini]

Jee 2021 aspirants is like 🐦 without wings 😎😎😎😎