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Tuesday, 23 July 2013

Friday, 21 June 2013


 A radical expression is an expression containing a square root.

Examples of Radical Expression
are examples of radical expression.
It is also an example of  Redical Expression

To solve this kind of equations, remember when you have a variable inside a square root, you undo the root by doing the opposite: squaring.

Given , you would square both sides:

More about Radical Expression
Radical: Thesymbol that is used to denote square root or nth roots.
Radicand: Radicand is a number or expression inside the radical symbol.
For example, 5 is the radicand in.
Radical equation: An equation containing radical expressions with variables in the radicands.
Radical inequality: An inequality containing a radical expression with the variable in the radicand.

Solved Example on Radical Expression
Evaluate the radical expression  when a = 2 and b = 4.
A. 9
B. 8
C. 7
D. 6
Correct Answer: D
Step 1:         [Substitute the values of a and b in the given radical expression.]
Step 2:                                    [Find the positive square root.]
Step 3:                                        [Multiply.]
Step 4:                                           [Add.]
Step 5: = 6                                            [Simplify.]
The terms which are Related for Redical Expression

  • Expression
  • Square Root
  • Variable
  • Radicand
  • Radical
  • Radical Equation
  • Radical Inequality 
 Note: You can always check your answers in a solved equation by plugging your answer back into the original equation and making sure that it fits. (This is because the very act of squaring the sides can create solutions that never existed before).

Radical Expression

Thursday, 20 June 2013

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Wednesday, 19 June 2013

Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. Familiar examples include a swinging pendulum and AC power. The term vibration is sometimes used more narrowly to mean a mechanical oscillation but is sometimes used as a synonym of "oscillation". Oscillations occur not only in physical systems but also in biological systems, from human society to the brain.


Tuesday, 18 June 2013


A microscope (from the Ancient Greek: μικρός, mikrós, "small" and σκοπεῖν, skopeîn, "to look" or "see") is an instrument used to see objects that are too small for the naked eye. 

Compound Microscope

 A simple microscope is used to observe small objects. However it cannot be used tosee very minute objects like blood corpuscles, plant and animal cells, microorganisms like bacteria etc. For observing these objects, we use an opticalinstrument called      a    compound microscope.


A compound microscope consists of the following parts:
  • Objective lens

The objective lens of a compound microscope is a convex lens of very short focal length (fo) that is fo < 1cm. The object to be seen is kept very close to the objective lens.
  • Eye piece

The eye piece of a compound microscope is also a convex lens of short focal length fe. But fe > fo.
  • Microscope tube

The objective lens and the eyepiece are mounted coaxially (having a common axis) at the ends of two brass tubes which can be made to slide into each other so that the distance between the two lenses can be adjusted.


  1. The objective produce a real inverted & magnified image of the object.
  2. The eye piece is placed within the focal length of the object infront of the image formed by it.
  3. The eye piece serve as magnifying glass & produces a very much enlarged image of the object which is inverted.


 It is used by Pathologists,Microbiologists in laborateries

Compound Microscope

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