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The latest Messages 2
2021-07-11 18:07:13
Allen DLP Biolgy
1. https://drive.google.com/file/d/0Bxc_TL0MSWTEYngwWk1CS2ZEQ2M/view?usp=drive_open
2. https://drive.google.com/file/d/0Bxc_TL0MSWTEM1FiYlhwcWJEVms/view?usp=drive_open
3. https://drive.google.com/file/d/0Bxc_TL0MSWTER1MyNkFqTTBMQ3M/view?usp=drive_open
4. https://drive.google.com/file/d/0Bxc_TL0MSWTEb0c2SnZCWXRMdjQ/view?usp=drive_open
5. https://drive.google.com/file/d/0Bxc_TL0MSWTEQVZwdlgwcHJ4RUU/view?usp=drive_open
6. https://drive.google.com/file/d/0Bxc_TL0MSWTEeWd2Y2FCMU82bkU/view?usp=drive_open
7. https://drive.google.com/file/d/0Bxc_TL0MSWTEQUVNQWRKM0ozUUU/view?usp=drive_open
8. https://drive.google.com/file/d/0Bxc_TL0MSWTERzc4dHg4SmRFTnc/view?usp=drive_open
523 views15:07
2021-07-11 14:39:04
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104 views11:39
2021-07-11 12:44:35
Revision Notes on Atomic Physics
e/m of an electron (Thomson Method):-
(a) e/m of a particle is called the specific charge of the particle.
e/m = v/rB
Here, r is the radius of curvature, B is the strength of magnetic field, v is the velocity, e is the charge on cathode ray particle and m is the mass.
(b) v = E/B
Electric field:- E = V/d
H
Photo electric effect:- Photo-electric effect is the phenomenon of emission of electrons from the surfaces of certain substances, mainly metals, when light of shorter wavelength is incident upon them.
Effect of collector’s potential on photoelectric current:-
(a) Presence of current for zero value potential indicates that the electrons are ejected from the surface of emitter with some energy.
(b) A gradual change in the number of electrons reaching the collector due to change in its potential indicates that the electrons are ejected with a variety of velocities.
(c) Current is reduced to zero for some negative potential of collector indicating that there is some upper limit to the energy of electrons emitted.
(d) Current depends upon the intensity of incident light.
(e) Stopping potential is independent of the intensity of light.
Effect of intensity of light:- The photoelectric currentis directly proportional to theintensity of incident radiation.
Effect of frequency of light:-
(a) Stopping potentialdepends upon thefrequency of light. Greater the frequency of light greater is the stopping potential.
(b) Saturation current is independent of frequency.
(c) Threshold frequency is the minimum frequency, that capable of producing photoelectric effect.
Laws of Photoelectricity:-
(a) Photoelectric effect is an instantaneous process.
(b) Photoelectric current is directly proportional to the intensity of incident light and is independent of its frequency.
(c) The stopping potential and hence the maximum velocity of the electrons depends upon the frequency of incident light and is independent of its frequency.
(d) The emission of electrons stops below a certain minimum frequency known as threshold frequency.
Energy contained in bundle or packet:-
E = hf = hc/λ
Here h is the Planck’s constant and f is the frequency.
Work function:- It is defined as the minimum energy required to pull an electron out from the surface of metal. It is denoted by W0.
Einstein’s equation of photoelectric effect:-
(a) ½ mvmax2 = hf – W0
(b) ½ mvmax2 = hf – hf0 = h(f- f0) = h [c/λ – c/λ0]
(c) eV0 = hf - W0
(d)V0 = [(h/e)f] – [W0/e]
Here f0 is threshold frequency.
Threshold frequency (f0):- f0 = work function/h = W/h
Maximum kinetic energy of emitted photo electrons:-
?Kmax= ½ mvmax2 = eV0
Threshold wavelength:- λ0 = c/f0 = hc/hf0 = hc/W
Slope of V0~ v graph:- Slope= h/e
Rest mass of photon = 0, Charge = 0
Energy of photon:- E = hf = hc/λ
Momentum of photon:- p = E/c = h/λ = hf/c
Mass od photon:- m = E/c2 = h/cλ = hf/c2
For electron, λe = [12.27/√V]Å
For proton, λp = [0.286/√V]Å
For alpha particle, λα = [0.286/√V]Å
For particle at temperature T, λ = h/√3mKT (E = 3/2 KT)
The wavelength of electron accelerated by potential difference of V volts is:-
λe= [12.27/√V]Å
Number of photons:-.
(a) Number of photons per sec per m2, np = Intensity/hf
(b) Number of photons incident per second, np = Power/hf
(c) Number of electrons emitted per second = (efficiency per surface)× (number of photons incident per second)
Compton wave length:-
(a) λc = h/m0c
Here h is the Planck’s constant, m0 is the rest mass of electron and c is the speed of light.
(b) Change in wavelength:- λ' – λ =λc (1-cos?)
de Broglie wavelength (λ):-λ = h/mv = h/√(2mE) = h/√(2meV)
In accordance to Bohr’s postulate of atomic structure, the angular momentum of an electron is an integral multiple of h/2π.
So, mvr = nh/2π
Bragg’s diffraction law:- 2dsinθ = nλ
Here λ is the wavelength of electron and d is distance between the planes.
Rutherford’s atomic model (α-particle scattering):-
(a) N(θ) ∝ cosec4(θ/2)
MOST IMPORTANT FOR NEET JEE
167 views09:44
2021-07-11 12:44:34
Animal kingdom Examples Mnemonics
PHYLUM PORIFERA: Spongilla,Euspongia, Sycon
PHYLUM COELENTERATA (CNIDARIA):
Examples: Physalia, Obelia, Meandrina, Adamsia, Aurelia, Gorgonia, Pennatula, Hydra.
Mnemonic: Physics Objective exams MeinAdam Aur George Ne Pen Hide kiya.
Physics – Physalia
Objective – Obelia
Mein – Meandrina
Adam – Adamsia
Aur – Aurelia
George – Gorgonia
Ne – Cnidaria
Pen – Pennatula
Hide – Hydra.
PHYLUM PLATYHELMINTHES:
Examples: Taenia, Planaria, Fasciola.
Mnemonic: Teeno ki Planning Fail hui.
Teeno – Taenia
Planning – Planaria
Fail – Fasciola
PHYLUM MOLLUSCA:
Examples: Pinctada, Sepia, Octopus, Dentalium, Aplysia, Chaetopleura, Pila, Loligo.
MNEMONIC: Phir se Octopus dekhenge, aap pehle chai pe lo.
Phir – Pinctada
Se – Sepia
Octopus
Dekhenge – Dentalium
Aap – Aplysia
Chai – Chaetopleura
Pe – Pila
Lo – Loligo
PHYLUM ECHINODERMATA:
Examples: Ophinuria, Antedon, Asterias, Echinus, Cucumaria.
MNEMONIC: office mein aunty asked for ek cucumber.
Office – Ophinuria
Aunty – Antedon
Asked – Asterias
Ek – Echinus
Cucumber – Cucumaria.
PHYLUM ASCHELMINTHES/ NEMATODA:
Examples: Ancylostoma, Wuchereria, Ascaris, Rhabditis.
MNEMONIC: Annie Bechaari AksarReh jati hai
Annie – Ancylostoma
Bechaari – Wuchereria
Aksar – Ascaris
Reh – Rhabditis.
PHYLUM ANNELIDA:
Examples: Hirudinaria, Pheretima, Nereis.
MNEMONIC: HERO PHERE KE TIME NAHITHA.
Hero – Hirudinaria
Phere ke time – Pheretima
Nahi – Nereis.
PHYLUM ARTHROPODA:
Examples: Locusta, Limulus, Bombax, Apies, Scorpion, Butterfly, Palaemon, Laccifer, Anopheles, Culex, Aedes.
MNEMONIC: LOLITA BOMBAY AAKAR STORE SE BUTTER PEHLE MAT LENA.
LoLita – Locusta & Limulus
Bombay – Bombax
Aakar – Apies
Store – Scorpion
Butter – Butterfly
Pehle – Palaemon
Mat – Mosquitoes (Anopheles, Culex, Aedes)
Lena – Laccifer.
ANIMAL KINGDOM
Mnemonic: Sponges---
Pores All Your Sides.
Pore – Porifera
All – Spongilla
Your – Euspongia,
Sides – Sycon.
Examples: Spongilla, Euspongia, Sycon
PHYLUM COELENTERATA (CNIDARIA):
Examples: Physalia, Obelia, Meandrina, Adamsia, Aurelia, Gorgonia, Pennatula, Hydra.
Mnemonic: Physics Objective exams MeinAdam Aur George Ne Pen Hide kiya.
Physics – Physalia
Objective – Obelia
Mein – Meandrina
Adam – Adamsia
Aur – Aurelia
George – Gorgonia
Ne – Cnidaria
Pen – Pennatula
Hide – Hydra.
PHYLUM PLATYHELMINTHES:
Examples: Taenia, Planaria, Fasciola.
Mnemonic: Teeno ki Planning Fail hui.
Teeno – Taenia
Planning – Planaria
Fail – Fasciola
PHYLUM MOLLUSCA:
Examples: Pinctada, Sepia, Octopus, Dentalium, Aplysia, Chaetopleura, Pila, Loligo.
MNEMONIC: Phir se Octopus dekhenge, aap pehle chai pe lo.
Phir – Pinctada
Se – Sepia
Octopus
Dekhenge – Dentalium
Aap – Aplysia
Chai – Chaetopleura
Pe – Pila
Lo – Loligo
PHYLUM ECHINODERMATA:
Examples: Ophinuria, Antedon, Asterias, Echinus, Cucumaria.
MNEMONIC: office mein aunty asked for ek cucumber.
Office – Ophinuria
Aunty – Antedon
Asked – Asterias
Ek – Echinus
Cucumber – Cucumaria.
PHYLUM ASCHELMINTHES/ NEMATODA:
Examples: Ancylostoma, Wuchereria, Ascaris, Rhabditis.
MNEMONIC: Annie Bechaari AksarReh jati hai
Annie – Ancylostoma
Bechaari – Wuchereria
Aksar – Ascaris
Reh – Rhabditis.
PHYLUM ANNELIDA:
Examples: Hirudinaria, Pheretima, Nereis.
MNEMONIC: HERO PHERE KE TIME NAHITHA.
Hero – Hirudinaria
Phere ke time – Pheretima
Nahi – Nereis.
PHYLUM ARTHROPODA:
Examples: Locusta, Limulus, Bombax, Apies, Scorpion, Butterfly, Palaemon, Laccifer, Anopheles, Culex, Aedes.
MNEMONIC: LOLITA BOMBAY AAKAR STORE SE BUTTER PEHLE MAT LENA.
LoLita – Locusta & Limulus
Bombay – Bombax
Aakar – Apies
Store – Scorpion
Butter – Butterfly
Pehle – Palaemon
Mat – Mosquitoes (Anopheles, Culex, Aedes)
Lena – Laccifer.
139 views09:44
2021-07-11 10:23:48
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208 views07:23
2021-07-10 16:43:09
How to give the final shape to the NEET 2021 Preparation :
Firstly, eliminate the stress, release the pressure. Don’t let the pressure of the exam period affect your performance. Lean on a practical approach and focus on winning. Here is a step to step guide that will help you make the most out of this time.
1. Map your class notes with NCERT
Class notes play a very important role; as they are handwritten, they tend to remain in your memory. Now is the time to recall and restore all your self-made notes. Remember, whichever topic you are revising, always pull out your self-made class notes for the ultimate learning. The self-made notes have the magic to bring you in term with even the most complex concept.
While studying, keep on mapping your topic and subtopics from the NCERT and self-made notes. Underline, Highlight. Within one week, you will see that you have developed a speed.
2. Chapter wise PYQs in the sequence of Bock Strategy
Past 20 years PYQ (Previous Years’ Questions) are only necessary; there is no need to go further back in the date. Do not deviate from that; focus on these questions only, along with the continuous mapping. This way, you will start gaining more confidence in basic topics and even complex topics. Try converting your time spent in taking pressure and use that energy to increase productivity.
3. AD Revision Plan
AD stands for alternate days. It would be best if you formed a revision plan based on the alternate day strategy. If you are revising Physics, Biology (Botany) on Monday, you should revise Chemistry and Biology (Zoology), and the cycle continues.
Note: you should fix the time for revision at two hours before sleeping, and you must revise based on the AD Plan. It would be best if you planned to revise what you had studied in the week/prior week. Remember, immediate revision gives the best result—Reattempt the PYQs as a part of the revision plan.
This way, you will be using the 30 days very productively and effectively. These 30 days will boost and align your energy very immensely.
All the best!!
436 viewsedited 13:43
2021-07-10 10:05:36
Vedantu Questions Of Some Chapters
Amines -
https://drive.google.com/file/d/1dE_87A5q5K-2s87HTQKjeBR1M9wA4vNm/view?usp=sharing
Electrochemistry -
https://drive.google.com/file/d/1z3QEQz2kitwUOwwM2pTPzxMjvzrc8KXQ/view?usp=sharing
Principles Of Inheritance And Variation -
https://drive.google.com/file/d/1l7z5dbpEAjJPXOE1ZOn8x-Ygge83W1Uh/view?usp=sharing
Genetics -
https://drive.google.com/file/d/1QXQFL0SHJ-klN0dZc8fDQFtzbWV4dD3W/view?usp=sharing
Aldehyde Ketone And Carboxylic Acid -
https://drive.google.com/file/d/1QXQFL0SHJ-klN0dZc8fDQFtzbWV4dD3W/view?usp=sharing
Join
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437 views07:05
2021-07-10 10:05:35
Vedantu Questions Of Some Chapters
Biomolecules -
https://drive.google.com/file/d/1G3m4cbAstb6kEf0clNGadiPafy8RxmI2/view?usp=sharing
Neural Control And Coordination -
https://drive.google.com/file/d/1WUD9Xp-qFZnxJfa-7kAv7wbd9B3kvd88/view?usp=sharing
Molecular Basis Of Inheritance -
https://drive.google.com/file/d/1i5P1V8XSn_6NYZXR8QX4Ai4qAJ5i0PYy/view?usp=sharing
P Block Group 13 & 14 -
https://drive.google.com/file/d/1dPxXj4YiLHfKKXxYof9IHIzGuu134HsO/view?usp=sharing
Reproduction In Organisms -
https://drive.google.com/file/d/1dl0S0wXYtc2dAqrNDXI23VvVqsg7LIAo/view?usp=sharing
Join
@BOOKSDEN
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358 views07:05
2021-07-10 10:05:35
Vedantu Questions Of Some Chapters
P Block Group 15-18 -
https://drive.google.com/file/d/1ZkZEBuGe2uQ2q-0D_Ri7sfKUDz7SkJVY/view?usp=sharing
Haloalkanes And Haloarenes -
https://drive.google.com/file/d/1s50YE5fjkV7qRyEQpAYV4xiE70Rpq6qd/view?usp=sharing
Cell Cycle And Division -
https://drive.google.com/file/d/132s9fmzG8pSbU4vVEALwWDI93_IIZNlE/view?usp=sharing
GOC -
https://drive.google.com/file/d/1mSq2cQsY4lzBqODgNaDWW5QaHmoY9sTA/view?usp=sharing
Principles Of Inheritance And Variation -
https://drive.google.com/file/d/1PMIrnNbNd7xdHmTNQVvyMXiCaorsZOUp/view?usp=sharing
Join
@ETOOSLINK
━━━━━━━✧❂✧━━━━━━
330 views07:05
2021-07-10 10:05:34
Vedantu Questions Of Some More Chapters
Electrochemistry -
https://drive.google.com/file/d/1GeJEJhlszP7uFnirnisKl7XvtPGM_aL2/view?usp=sharing
P Block Group 15-18 -
https://drive.google.com/file/d/18U0rHNumb7_tx1TmiXG-EU3whgaiJh33/view?usp=sharing
Transport In Plants -
https://drive.google.com/file/d/1P86GTvprzCHypMXzGQY9mv_usdBmHL8n/view?usp=sharing
Cell The Basic Unit Of Life -
https://drive.google.com/file/d/1VJT0c7DKU-9WtJKc4U0eqTxg7MhFkwo9/view?usp=sharing
Fluid Mechanics -
https://drive.google.com/file/d/14f36RMnzs_yqIh1ZrLx-Pyga0woFCJm2/view?usp=sharing
Join
@BOOKSDEN
━━━━━━━✧❂✧━━━━━━
328 views07:05
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