CBSEtuts: January 2018

Specific Latent Heat

The amount of heat required to change the phase of a substance depends on the mass and the type of material of the substance.

A small ice cube melts quickly but a large block of ice melts very slowly.

100 J of heat energy can melt a large amount of wax, but the same amount of heat can only melt a small amount of iron.

The specific latent heat of a substance is the amount of heat required to change the phase of 1 kg of the substance at a constant temperature. specific-latent-heat-1

Binomial Nomenclature

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It was Proposed by Carolus Linnaeus.

According to this system of nomenclature, each animal or plant is given two names : the first one is the generic name and the second one is the name of the species.
Scientific names are always in Latin.
The first letter of the generic name is always capitalized and that of the specific name is written in small letter. For example, the scientific name of frog is Rana tigrina, in which Rana is the generic name and tigrina is the name of the species.

BINOMIAL NOMENCLATURE

Polynomial Long Division

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Polynomials - Long Division

Working rule to Divide a Polynomial by Another Polynomial:

Step 1: First arrange the term of dividend and the divisor in the decreasing order of their degrees.

Step 2: To obtain the first term of quotient divide the highest degree term of the dividend by the highest degree term of the divisor.

POLYNOMIAL LONG DIVISION

Read more about Polynomial Long Division

Golgi Apparatus Function

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Golgi apparatus :

Golgi bodies are absent in prokaryotic cells. Golgi complex is found in all eukaryotic cells except RBCs.

Ultrastructure :

It is also called Golgi complex or Golgi apparatus or Dictyosome (in plants cell).
It is made up of cisternae.
Golgi bodies are interconnected with the tubules.

GOLGI APPARATUS FUNCTION

Read more about Golgi Apparatus Function

scientific notation converter

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Converting To and From Scientific Notation

Converting To Scientific Notation

To Change from Standard Form to Scientific Notation:

Place the decimal point such that there is one non-zero digit to the left of the decimal point.

Count the number of decimal places the decimal has "moved" from the original number. This will be the exponent of the 10.

If the original number was less than 1, the exponent is negative; if the original number was greater than 1, the exponent is positive.

SCIENTIFIC NOTATION CONVERTER

COMBINATION FORMULA

Read more about scientific notation converter

combination formula

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Definition:

Each of the different groups or selections which can be formed by taking some or all of a number of objects, irrespective of their arrangements, is called a combination.

Notation: The number of all combinations of n things, taken r at a time is denoted by

nCr is always a natural number.

COMBINATION FORMULA

linear pair

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Two adjacent angles are said to form a linear pair of angles, if their non-common arms are two opposite rays.

In the adjoining figure, ∠AOC and ∠BOC are two adjacent angles whose non-common arms OA and OB are two opposite rays, i.e., BOA is a line

∴ ∠AOC and ∠BOC form a linear pair of angles.

Theorem 1:

Prove that the sum of all the angles formed on the same side of a line at a given point on the line is 180°.

Given: AOB is a straight line and rays OC, OD and OE stand on it, forming ∠AOC, ∠COD, ∠DOE and ∠EOB.

LINEAR PAIR

relative frequency

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What is Cumulative Frequency in statistics

If the frequency of first class interval is added to the frequency of second class and this sum is added to third class and so on then frequencies so obtained are known as Cumulative Frequency (c.f.).

There are two types of cumulative frequencies (a) less than, (b) greater than

A table which displays the manner in which cumulative frequencies are distributed over various classes is called a cumulative frequency distribution or cumulative frequency table.

There are two types of cumulative frequency.

(1) Less than type

(2) Greater than type

CBSEtuts

Wednesday 31 January 2018

Latent Heat