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Answered on 26 Apr Learn NEET-UG Coaching

Dr. Aadithya T

https://vz-3ad30922-ba4.b-cdn.net/eb8c4c49-97b0-4417-aa02-23bd015abde0/play_480p.mp4
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Lesson Posted on 22/11/2021 Learn NEET-UG Coaching +2 Chemistry Some Basic Concepts of Chemistry

Isotopes-1

Jayaraj B

I am a researcher and teacher of chemistry for several years. I am giving home tuition as well as online...

1) What is an Isotope? Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. 2) What determines the atomic number of an element? A number of protons in the nucleus. Examples of Isotopes: Element Isotopes Hydrogen 1H... read more

1) What is an Isotope?

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons.

2) What determines the atomic number of an element?

A number of protons in the nucleus.

Examples of Isotopes:

Element Isotopes
Hydrogen 1H (A=1), 2H(A=2) and 3H(A=3).Protium(A=1) , deuterium(A=2) and tritium (A=3). Hydrogen is the only element whose isotopes have unique names.
Carbon 12
6
C
 (A=12, 13
6
C (A=13)
, 14
6
C (A=14)
Helium 3
2
He (A=3)
, 4
2
He (A=4)
Uranium 235
92
U
 (A=235), and  239
92
U (A=239)
Oxygen 16O(A=16), 17O (A=17), and 18O(A=18).

Standard Notation of Isotopes: Also known as AZE notation 'A' is the mass number, 'Z' is the atomic number and E is for element. 

It is to indicate the mass number (A) with a superscript at the upper left of the chemical symbol and to indicate the atomic number with a subscript at the lower left.

Example: Carbon-13, 13
6
C

to be continued ......

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Answered on 27/10/2021 Learn NEET-UG Coaching +3 Tuition IIT JEE Coaching Medical Entrance Coaching

Anjali Tiwari

BIOLOGY FACULTY NEET/BOARDS/ICAR READY FOR DIVE WITH ME IN BIO OCEAN...

See Ashok ! There are no electrons inside nucleus...but protons and neutrons ( proton+electron) are there. There occurs radioactivity and some of the neutrons convert themselves in proton and thus the electron trapped with neutrons comes outside. Hope it helps! Thank uh
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Lesson Posted on 17/09/2021 Learn NEET-UG Coaching

BREATHING AND EXCHANGE OF GASES PART 1 NEET

Dr Bhargavi Dade

I am doctor by profession and a biology professor with experience in international teaching experience...

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Lesson Posted on 17/09/2021 Learn NEET-UG Coaching

DIGESTIVE SYSTEM NEET

Dr Bhargavi Dade

I am doctor by profession and a biology professor with experience in international teaching experience...

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Lesson Posted on 16/05/2021 Learn NEET-UG Coaching +2 Class 11 Tuition Class 12

BIOLOGY CLASS 11 & 12- Concept on MITOCHONDRIA

Dr. Vineet Kr Srivastava

I am an experienced, qualified teacher and tutor with over 15 years of experience in teaching SCIENCE...

Mitochondria (1) Definition: (Gk – mito = thread ; chondrion = granule) Mitochondria are semi autonomous having hollow sac like structures present in all eukaryotes except mature RBCs of mammals and sieve tubes of phloem. (2) These are absent in all prokaryotes like bacteria and cyanobacteria. (3)... read more

Mitochondria

(1) Definition: (Gk – mito = thread ; chondrion = granule) Mitochondria are semi autonomous having hollow sac like structures present in all eukaryotes except mature RBCs of mammals and sieve tubes of phloem.

(2) These are absent in all prokaryotes like bacteria and cyanobacteria.

(3) Mitochondria are also called chondriosome, chondrioplast, plasmosomes, plastosomes and plastochondriane.

Plastids
(1) Definition: Plastids are semiautonomous organelles having DNA, RNA, Ribosomes and double membrane envelope which store or synthesize various types of organic compounds as ATP and NADPH + H+ etc.

(2) These are largest cell organelles in plant cell.

(3) History: Haeckel (1865) discovered plastid, but the term was first time used by Schimper (1883).

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Lesson Posted on 15/04/2021 Learn NEET-UG Coaching +2 Class 11 Mechanics

Trouble Understanding Friction?

Vaidnyanic

Vaidnyanic is my humble attempt to make studies interesting to students and make them more curious and...

Many of my students make a widespread mistake of taking friction value as f= μ N. Where μ = coefficient of friction and N =Normal Reaction. So is it incorrect? The answer is not exactly. With that, I mean to say that the above formula gives you maximum friction. Still, confused? Read below Consider... read more

Many of my students make a widespread mistake of taking friction value as f= μ N. Where μ = coefficient of friction and N =Normal Reaction.

So is it incorrect? The answer is not exactly. With that, I mean to say that the above formula gives you maximum friction.

Still, confused? Read below

Consider a block on a rough surface with μ= 0.5. Now let's say this block has a mass of 10kg, and you are pushing the block in the horizontal direction towards the right with a force of 150N. If we take acceleration due to gravity g as 10m/s², what we can calculate is as follows

The Normal Reaction on the block will be

N=mg = 10 x10= 100N.

So the Max Friction Value here is

f= μ N = 0.5 x 100 = 50N

The block is acted upon by two forces, one on the right, which you applied (150N) and max friction on the left (50N), so the block moves rightwards with 150 - 50 = 100N.

But!!!!!!!!!!!!!!

Consider the same scenario, instead of pushing with 150N, what if you would have pushed with, say, a force of 30N.

If you take the friction value as 

f= μ N = 0.5 x 100 = 50N

With that logic, you pushed the block rightwards with 30N and friction acting on the block leftwards with 50N, so basically, the block moves towards the left with 50-30 =20N.

Common! Think is it possible?? You are pushing something on the right, and it moves on the left??

So what mistake are we making?

See the frictional force which u take as f= μ N is maximum, and the friction force can take any value between 0 and f= μ N. So when you apply a force less than f= μ N, friction force will be the same value as that force if no other forces are acting.

In the above example, when you apply 30N, the friction acting is also 30N; this cancels the external force, and the block remains Stationary.

Now that makes sense.

Cheers!

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Lesson Posted on 04/03/2021 Learn NEET-UG Coaching +4 Chapter 4-Motion in a Plane IIT JEE Foundation Course IIT JEE Integrated Coaching IIT JEE Mains Coaching

Triangle law of vector addition

Rajan Mittal

I am an Engineer by qualification and a teacher by profession. I have been teaching since 1995. I teach...

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Lesson Posted on 04/03/2021 Learn NEET-UG Coaching +4 Chapter 4-Motion in a Plane IIT JEE Foundation Course IIT JEE Integrated Coaching IIT JEE Mains Coaching

Parallelogram law of vector addition

Rajan Mittal

I am an Engineer by qualification and a teacher by profession. I have been teaching since 1995. I teach...

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Lesson Posted on 04/03/2021 Learn NEET-UG Coaching +4 Chapter 4-Motion in a Plane IIT JEE Integrated Coaching IIT JEE Foundation Course IIT JEE Mains Coaching

Polygon law of vector addition

Rajan Mittal

I am an Engineer by qualification and a teacher by profession. I have been teaching since 1995. I teach...

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