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Lesson Posted on 22/09/2020 CBSE/Class 12/Science/Physics/Unit 8-Atoms & Nuclei/ATOMS Tuition CBSE

Written Discussion on Physics Chapter : Atoms and Nuclei

Surbhi

Certified teacher. I have been teaching students since 5 years. The students i have taught have scored...

This Demo lesson includes the introduction to one of the highest weightage chapters of Physics inboards ATOMS Starting from Rutherford's nuclear model of an atom to the alpha particle trajectory, physics observes it's conclusions from points to derivations ( mentioning the derivation of the two forces... read more

This Demo lesson includes the introduction to one of the highest weightage chapters of Physics inboards

ATOMS

  • Starting from Rutherford's nuclear model of an atom to the alpha particle trajectory, physics observes it's conclusions from points to derivations ( mentioning the derivation of the two forces in a hydrogen atom here) to atomic spectra. There have been various experiments mentioned in this chapter that is about to be discussed. 
  1. First, Thomson's model concluded that an atom is a spherical cloud of positive charges with electrons embedded in it. But since the information wasn't enough, Rutherford came with his nuclear model of an atom. In it,  most of the mass of the atom and all its positive charge is concentrated in a tiny nucleus (typically one by ten thousand the size of an atom), and the electrons revolve around it.
  2. Drawbacks of Rutherford's model : 
    • It predicts that atoms are unstable because the accelerated electrons revolving around the nucleus must spiral into the nucleus. This contradicts the stability of matter.
    • It cannot explain the characteristic line spectra of atoms of different elements.

 3. Atomic Spectrum :

    • Lyman series 
    • Balmer series
    • Paschen series
    • Brackett series
    • Pfund series
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Lesson Posted on 04/08/2020 Tuition CBSE/Class 12/Science/Biology/Unit 4- Biotechnology and Its Applications/Biotechnology and Its Applications CBSE/Class 11/Science/Biology

Lets Study Basics of Molecular Inheritance:

Arpita

Difference between RNA and DNA 2’ oh group in aldopentose U instead of T Most RNAs carry out their functions as single strands Structurally and functionally more diverse suited to a diverse array of cellular functions Rna is unique in the sense that its the only molecule to have a role in... read more

Difference between RNA and DNA

  1. 2’ oh group in aldopentose
  2. U instead of T
  3. Most RNAs carry out their functions as single strands
  4. Structurally and functionally more diverse suited to a diverse array of cellular functions
  5. Rna is unique in the sense that its the only molecule to have a role in storage and transmission of information and in catalysis(catalytic RNAs called ribozymes)

Three major kinds of RNAs are produced

  1. Messenger RNA
  2. Transfer RNA
  3. Ribosomal RNA

NOTE:- Additional specific RNA molecules have regulatory or catalytic functions or are precursors of the three main classes of RNAs. RNA molecules can be substrates of RNA molecules.

Diff between replication and transcription:-

  1. During replication, the entire chromosome is replicated. In transcription, only some of the DNA segments are transcribed marked by specific regulatory sequences.
  2. Primers are required in replication but not in transcription.
  3. RNA Polymerase used in place of DNA polymerase.

Similarities between R and T

  1. The fundamental chemical mechanism is the same.
  2. Polarity is the same.
  3. And it uses a template.
  4. Like replication, transcription has initiation, elongation and termination.

 

 

 

 

 

 

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Lesson Posted on 04/08/2020 CBSE CBSE/Class 12 CBSE/Class 12/Science/Chemistry/Unit II: Solutions +1 Tuition less

Class 12/Chapter-2/Solutions

Rajasree S Nair

I have over 20 years of experience in teaching chemistry for CBSE/ICSE engineering college. Teaching...

Expressing the concentration of a solution:- Before we start with the concentration, we should understand the calculation of moles. A number of moles =mass of solute /Molecular mass of the substance. Example: Number of moles in 80g of NaCl=80/40=2(molecular mass of NaCl=40) Molarity Now let us see... read more

Expressing the concentration of a solution:-

Before we start with the concentration, we should understand the calculation of moles.

A number of moles =mass of solute /Molecular mass of the substance.

Example: Number of moles in 80g of NaCl=80/40=2(molecular mass of NaCl=40)

Molarity

Now let us see the calculation of molarity of a solution which is already discussed in class11.

Molarity=No of moles of solute/volume of solution in litres

Molarity=W2X1000/M2XV(W2 =mass of solute, M2=molecular mass of solute, V=volume of solution)

Example-1

Calculate the molarity of a solution containing 8g of NaCl in 500ml solution.

Molarity of the solution=8X1000/40X500=0.4moles/L

Molality

It is the number of moles of solute in one kg of the solvent.

Molality=W2X1000/M2XW1(W1=mass of solvent)

Example-2

Calculate the molarity of a solution containing 18g of glucose in 700g of water.

Molality of the solution=18x1000/180x700=0.14moles/kg

Molarity and molality are always confusing for the students. It is better to study the formulae for the calculation.

Q1.Molarity depends on temperature, whereas molality is independent. Why?

 A. Molarity depends on volume which is affected by temperature changes. As a result, molarity varies. Molality depends on mass which is not affected by temperature.

Q2.One molar solution or one molal solution which is more concentrated?

      One molar solution is more concentrated because it contains less water than one molal solution.

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Answered on 30/04/2020 CBSE/Class 12/Science/Mathematics/Unit III: Calculus/Applications of Derivatives Tuition

Dr Shweta K.

Zoom, Google classroom
Answers 721 Comments 1
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Answered on 13/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Abhishek Chauhan

A teacher who redefines the way you understand concepts.

If organisms don't reproduce, new organisms will not be produced and because old organisms have to die (that's just how biology works, living cells. Thus the whole organism don't live forever), the entire species will disappear in one life-time of that organism. Think it this way, along with the 4 billion... read more

If organisms don't reproduce, new organisms will not be produced and because old organisms have to die (that's just how biology works, living cells. Thus the whole organism don't live forever), the entire species will disappear in one life-time of that organism.

Think it this way, along with the 4 billion years history of life evolution on earth there were many species which could not reproduce adequately. Because of that all of those species got eliminated. And that's why in today's world all organisms reproduce (effectively) because these are the survivor species, ancestors of today's organisms were the only one who figured out effective reproduction through the process of evolution. 

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Answered on 12/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Anita D.

Education is only a tool with of that u can gain every thing

In asexual reproduction, offsprings are produced by a single parent without the involvement of gamete formation and fusion. Thus offsprings resemble the parent genetically and morphologically. In reproduction, the fusion of two gametes occurs, and fertilization and meiosis are essential events.
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Answered on 18/06/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Deepika Agrawal

Interested to teach to class 1 to 5 , 6 to 10 , 11&12

In plants, the units of vegetative propagation such as runner, rhizome, sucker, tuber, offset, bulb are all capable of giving rise to new offsprings. Examples of vegetative propagation: (i) Vegetative propagation by leaves, in Bryophyllum (ii) Vegetative propagation by the stem (rhizome) in Ginger, Turmeric... read more

In plants, the units of vegetative propagation such as runner, rhizome, sucker, tuber, offset, bulb are all capable of giving rise to new offsprings.

Examples of vegetative propagation:

(i) Vegetative propagation by leaves, in Bryophyllum

(ii) Vegetative propagation by the stem (rhizome) in Ginger, Turmeric etc.

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Answered on 13/05/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Narendrakumar Vishwakarma

Physics and Mathematics Expert with more than 5 Years of Experience

Gametogenesis is a process of producing gametes. And while producing haploid gametes, the cell has to go through the media. Therefore we can say that meiosis and gametogenesis are always interlinked.
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Answered on 28/07/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Define external fertilization. Mention its disadvantages.

Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

The type of fertilisation in which male and female gamete takes place outside the body of the female is called external fertilisation. It is commonly observed in aquatic animals like starfish, frog and fish. Disadvantages are most of the male and female gametes will go wasted, i.e. it will remain unfertilised.... read more

The type of fertilisation in which male and female gamete takes place outside the body of the female is called external fertilisation. It is commonly observed in aquatic animals like starfish, frog and fish. Disadvantages are most of the male and female gametes will go wasted, i.e. it will remain unfertilised. External surroundings may cause harm to the gametes, which is present outside.

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Answered on 28/07/2020 CBSE/Class 12/Science/Biology/Unit 1- Reproduction/Reproduction in Organisms

Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals? read more
Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?

 
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Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

The animals which give birth to the young ones are called viviparous animals. The animals which lay eggs are called oviparous animals. The eggs of few animals are easy to observe since they lay outside their bodies. So there is a higher risk of the eggs being eaten by their enemies, or it may fall from... read more

The animals which give birth to the young ones are called viviparous animals. The animals which lay eggs are called oviparous animals. The eggs of few animals are easy to observe since they lay outside their bodies. So there is a higher risk of the eggs being eaten by their enemies, or it may fall from their nest. Thus, offspring of oviparous animals are at a higher risk as compared to the offspring of viviparous animals.

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