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Sia ? 6 years, 6 months ago
Check revision notes for summaries of chapters : <a href="https://mycbseguide.com/cbse-revision-notes.html">https://mycbseguide.com/cbse-revision-notes.html</a>
Posted by Parth Gandhi 6 years, 6 months ago
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Molarty of a solution is given by ,
Molarity (M) = ( Number of moles of the solute ) / ( Volume of solution in Litres )
Molar mass of sugar (C12H22O11) = 12 {tex}\times{/tex}12 + 22 {tex}\times{/tex} 1 {tex}\times{/tex} 11 {tex}\times{/tex} 16 = 342 g mol-1
No. of moles in 20 g of sugar = ( Mass of sugar ) / ( molar mass of sugar ) = {tex}\frac{20 \mathrm{g}}{342 \mathrm{g} \mathrm{mol}^{-1}}{/tex} = 0.0585 moles
Thus,
Molar concentration or Molarity (M) = 0.0585 mol / 2L = 0.02925 mol L-1
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Check NCERT solutions here : <a href="https://mycbseguide.com/ncert-solutions.html">https://mycbseguide.com/ncert-solutions.html</a>
Posted by Nandani Mehta 6 years, 6 months ago
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The binomial theorem (or binomial expansion) describes the algebraic expansion of powers of a binomial. According to the theorem, it is possible to expand the polynomial (<i>x</i> + <i>y</i>)<i>n</i> into a sum involving terms of the form <i>a x</i><i>b</i> <i>y</i><i>c</i>, where the exponents b and c are non negative integers with <i>b</i> + <i>c</i> = <i>n</i>, and the coefficient a of each term is a specific positive integer depending on n and b. For example (for <i>n</i> = 4),{tex}( x + y ) ^ { 4 } = x ^ { 4 } + 4 x ^ { 3 } y + 6 x ^ { 2 } y ^ { 2 } + 4 x y ^ { 3 } + y ^ { 4 }{/tex}
Posted by Manu Devi 6 years, 6 months ago
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On differentiating, displacement, we get velocity.
Velocity(v) = {tex}\frac { d x } { d t } = 12 - 3 t ^ { 2 }{/tex}
Again on differentiating, velocity, we get acceleration.
Acceleration(a) = {tex}\frac { d v } { d t } = - 6 t{/tex}
When velocity becomes zero,
12 - 3t2 = 0 {tex}\implies t = 2{/tex}
Therefore,
= -6t = -6 x 2 = -12 ms-2
The acceleration is negative i.e, retardation.
Posted by Bijay Tamang 6 years, 6 months ago
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Entity:- In accounting, a business (or the organisation) and its owners are considered as two different parties or separate entities. This is called the 'entity concept'. It means business is a separate legal entity apart from its owners.
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By making financial statements more relevant and reliable, the objectivity principle makes the financial information more usable for investors and creditors.
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Tripti Rawat 6 years, 6 months ago
Magnitude of vector A = {tex}\sqrt{(2)^2 + (6)^2 + (1)^2}{/tex}={tex}\sqrt{4+36+1}{/tex}={tex}\sqrt{41}{/tex}
Magnitude of vector B = {tex}\sqrt{(4)^2 + (2)^2 + (-11)^2}{/tex}={tex}\sqrt{16+4+121}{/tex}={tex}\sqrt{141}{/tex}
Posted by Richa Sharma 6 years, 6 months ago
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The ribosome is a cellular machine found in all organisms. It serves to convert the instructions found in messenger RNA (mRNA, which itself is made from instructions in DNA) into the chains of amino-acids that make up proteins.
Nucleus is made up of proton and neutrons.
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Tripti Rawat 6 years, 6 months ago
Mathematical induction is a mathematical proof technique. It is essentially used to prove that a property P(n) holds for every natural number n, i.e. for n = 0, 1, 2, 3, and so on. The method of induction requires two cases to be proved.
Posted by Abhishek Kumar 6 years, 6 months ago
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Tripti Rawat 6 years, 6 months ago
| Class interval | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 |
| Frequency | 2 | 10 | 5 | 6 | 8 |
Here the maximum frequency is 10 then the corresponding class 10 - 20 is the modal class
l = 10, h = 20 - 10 = 10, f = 10, f1 = 2, f2 = 5
Mode {tex}= l + \frac { f- f _ { 1 } } { 2 f -f _ { 1 } - f _ { 2 } } \times h{/tex}
{tex}= 10+ \frac { 10 - 2 } { 2 \times 10 - 2 - 5 } \times 10{/tex}
{tex}= 10 + \frac {80} {13}{/tex}
= 10 + 6.15
= 16.15
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Tripti Rawat 6 years, 6 months ago
Electromagnetic waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
Characteristics of electromagnetic waves:
- Electromagnetic waves are produced by accelerating or oscillating charge.
- E.M. waves do not require any material medium for their propagation.
- E.M. waves travel in free space with a velocity {tex}C = \frac{1}{{\sqrt {{\mu _0}{\varepsilon _0}} }}{/tex} which is equal to the velocity of light {tex}(c = 3 \times {10^8}m/s){/tex}.
- E.M. waves are transverse in nature.
Posted by Deepjyoti Borthakur 6 years, 6 months ago
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Tripti Rawat 6 years, 6 months ago
The organism level is the highest level of organization. In multicellular organisms, including humans, all cells, tissues, organs, and organ systems of the body work together to maintain the life and health of the organism.
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