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Lesson Posted on 15 Jul CBSE/Class 11/Science/Chemistry

Inert Pair Effect

Rupesh D.

Proven record of academic and teaching excellence. B.Tech from IIT with seven year experience in teaching...

On moving down in a group in p-block the higher valency becomes less stable and lower valencies become more stable. For example: Stability : C+4 > Si+4 > Ge+4 > Sn+4 > Pb+4 C+2 < Si+2 < Ge+2 < Sn+2 < Pb+2 Carbon tetrabromide CBr4 is stable and exits while PbBr4... read more

On moving down in a group in p-block the higher valency becomes less stable and lower valencies become more stable. For example:

Stability : C+4 > Si+4 > Ge+4 > Sn+4 > Pb+4

               C+2 < Si+2 < Ge+2 < Sn+2 < Pb+2

Carbon tetrabromide CBr4 is stable and exits while PbBr4 does not exits.

It is due increasing tendency of s-electron becoming inert in heavier elements (down the group). This reluctant of both s-electrons to take part in bonding is called the inert pair effect. This effect is especially seen in 13th and 14th group elements of the periodic table.

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Lesson Posted on 23 Jun CBSE/Class 11/Science/Physics

Physics

Sureel Adams

I can teach every topic very easily and make it stronger for the students.

Chapter 1 motion The rate of change of a position concerning specific the frame of reference. It's opposite of rest. Motion is everywhere but there's nothing about an absolute motion or an absolute rest. All motion in the universe is relative to each other it's mean no absolute value of motion. This... read more

Chapter 1 motion 

The rate of change of a position concerning specific the frame of reference. It's opposite of rest. Motion is everywhere but there's nothing about an absolute motion or an absolute rest. All motion in the universe is relative to each other it's mean no absolute value of motion.  This chapter focuses on relative motion only.

To the analysis of motion is requires a frame of reference, which may be fixed or movable best example is earth surface is a fixed frame of reference with respect terrestrial motion. Mathematically frame of text can be described as geometric coordinate systems example earth can represent on spherical coordinate systems with radius nearly 6500 km and similarly sun with 109 times larger space.

Vector is quantity having a certain direction to apply to is called the line of action. It Can be represented as bow method or blod latter's its has special properties such as a sum of the vector can be zero. Vectors must follow the triangular additional or parallelogram law. Multiplication of vector is different from ordinary scalar properties. Note that electric current and work done is scalar quantity due to its doesn't follow vectors new laws. Vector was advanced topic eighteen-century science still use today to the analysis of motion. Displacement, Velocity,  acceleration and force are considered as a vector quantity.

the proper definition of particles is a body having mass applying on the centre of gravity is the only point whereas all effects can be balanced but its dimensions are not considered in the analysis. Example consider your mobile is rest in your hand while you are moving with your surroundings arise questions are mobile is moving with respect surroundings or moving with respect to you. To answer these types questions are difficult without fixing a frame of reference because without a frame of reference we can't tell the difference between motion or rest.

Some motion can be treated as rest but its motion example at atomic level scale electrons are travelling near the speed of light and orbit around the nucleus of an atom that analysis is considered as microscopic levels whereas human senses activity considers as macroscopic levels where activity in atomic scales are highly negligible. The same problem also happens in Cosmo levels for example Consider earth as a particle moving in a circular orbit around the sun in a year. Sun is also moving an orbit to the star named sage A* in 250 million years which is centre of the galaxy. Our galaxy is moving towards a bigger galaxy as per telescopic observation in the night sky as per comparison of scale here activity on earth such as movements of people's and animals can be considered as neglected. Sence of motion requires a frame of reference.

As conclusion "nothing is absolute motion or absolute rest " all motion is relative.

It's all about motion.

Next topic is displacement and distance.

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Lesson Posted on 23 Jun CBSE/Class 11/Science/Physics

Physics 2 displacement

Sureel Adams

I can teach every topic very easily and make it stronger for the students.

Displacement (x) Can define as the shortest geometric distance between two points in space-time. Consider two point A (x1, y1) and B (x2,y2) A Distance between the two points can calculate by an application of a distance formula. AB = { (x2 - x1)^2 + (y2 - y1)^2}^0.5 Displacement is a vector... read more

Displacement (x)

Can define as the shortest geometric distance between two points in space-time. 

Consider two point A (x1, y1) and B (x2,y2) 

A Distance between the two points can calculate by an application of a distance formula.

AB = { (x2 - x1)^2 + (y2 - y1)^2}^0.5 

Displacement is a vector quantity which includes directions of the implementation. The magnitude of movement is written as x=|AB| and vectors x has direction denotes by a unit vector of x = AB ÷ |AB|. The Displacement of circular motion is zero whereas a distance is a scalar quantity it's never zero for motion, but conditions for rest is changed in distance is zero. 

Velocity of body  = displacement/ time interval 

Since displacement is a vector quantity, it makes velocity is a vector quantity. Speed is the difference with velocity is direction senses only. 

Displacement is important to vector quantity in an analysis of motions, sometimes it's treated as position vector its connection between geometry and nature.

 x = xi^+xj^+xk^ 

Next topic is Time

Don't shy to post questions.

 

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Lesson Posted on 23 Jun CBSE/Class 11/Science/Physics

Physics 3 time

Sureel Adams

I can teach every topic very easily and make it stronger for the students.

TIME Time is quantity. It can measure by clocks. Sundials were used in accent periods, but in modern period clocktower is made up it measures time by using gravity. The advance clock uses the caesium atom to accurately measure the energy emitted by electrons to jump back higher to lower energy levels... read more

TIME 

Time is quantity. It can measure by clocks. Sundials were used in accent periods, but in modern period clocktower is made up it measures time by using gravity. The advance clock uses the caesium atom to accurately measure the energy emitted by electrons to jump back higher to lower energy levels of sell.

Modern understanding of time is an event happening in space. Space and time are merged called space-time. Einstein thought experiment concluded that space-time combines into a single quantity. 

More about time is arrows of time is similar to the increase in entropy of the universe. Time moves only one direction only past to future there is no present, that why its called present. 

Next topic is VELOCITY.

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Answered on 05 Jun CBSE/Class 11/Science/Physics

Gaurav Kumar

MSc. Physics (Electronics) ,B.Ed. with 10 years experience of teaching Physics

Newton' first law (Law of Inertia) gives the qualitative idea, whereas Second law (Law of momentum) provides a quantitative approach of the first law. According to second law F=ma if F=0, then a=0 It means an object continues in its state(uniform motion or rest) until or unless an external force is applied. It... read more

Newton' first law (Law of Inertia) gives the qualitative idea, whereas Second law (Law of momentum) provides a quantitative approach of the first law.

According to second law F=ma

if F=0, then a=0

It means an object continues in its state(uniform motion or rest) until or unless an external force is applied.

It proves the first law.

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Answered on 27 May CBSE/Class 11/Science/Physics

Rahul Srivastava

Your choice , your decision i will try only to shape your enthusiasm"Where you can do study online"

Duality
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Answered on 14 May CBSE/Class 11/Science/Physics

Siddhant Kumar M.

PHYSICS faculty with 8 year experience ( IIT JAM and GATE qualified)

Yes, Flame consists of gases and gasses have mass.
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Lesson Posted on 17 Feb CBSE/Class 11/Science/Physics

How to feel conservation of momentum practically ?

Arun Pratap singh

I am a Mechanical engineer graduate right now pursuing my masters in mechanical from IIT Delhi. As from...

Lets say you are standing on a frictionless platform of ice. And you are holding a 10kg bag . You cannot walk on this platform as there is no frction , you will slide. Now lets say you want to move in right direction. What will you do.? Just throw that bag in left direction, you will get some velocity... read more

Lets say you are standing on a frictionless platform of ice. And you are holding a 10kg bag .

You cannot walk on this platform as there is no frction , you will slide.

Now lets say you want to move in right direction. What will you do.?

Just throw that bag in left direction, you will get some velocity in opposite direction by the law of conservation of momentum.

NOTE HERE IS : there is no friction or any other non conservative force . Its an assumption 

 

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