LENGTH FACT(OR)S

In Physics and Astronomy..,Length,Mass and Time are 3 main fundamental quantities through which we can understand Astronomy and the concepts behind it.

We are going to see some interesting facts based on length.

In Physics unit of length used is meter(m) which is one of the International system of units (SI Units).There are also different units of length as shown below.

Units of Length

DEFINITIONS OF UNITS OF FUNDAMENTAL QUANTITIES (L M T)

   

                                                        LENGTH


* Unit of Length is meter
* Symbol of meter is m
* Dimension of Length is L

                                               DEFINITION OF METER :

 

 

                                    
                                                               MASS

* Unit of Mass is kilogram
* Symbol of kilogram is kg
* Dimension of Mass is M

                                               DEFINITION OF KILOGRAM :

 

 

                                                            TIME

* Unit of Time is second
* Symbol of second is s
* Dimension of Time is T

                                               DEFINITION OF SECOND :

                                                 SUPPLEMENTARY QUANTITIES
                                                  ( DIMENSIONLESS QUANTITIES )

1. PLANE ANGLE

Unit of Plane Angle is radian
Symbol of radian is rad
No Dimension

2.SOLID ANGLE

Unit of Solid Angle is steradian
symbol of steradian is sr
No Dimension

 

PHYSICAL QUANTITIES

                                 Fundamental Quantities of Physics


1. Length(L)

2.Mass(M)

3.Time(T)

4.Amount of Substance(mol)

5.Temperature(K)

                                                
                                                 DEFINITION OF KELVIN

* Unit of Temperature is kelvin
* Symbol of kelvin is K
* Dimension of Temperature is K


6.Electric Current(A)

                                                        DEFINITION OF AMPERE

* Unit of Current is ampere
* Symbol of ampere is A
* Dimension of Current is A


7.Luminous Intensity(Cd)

                                                       DEFINITION OF CANDELA

* Unit of Luminous Intensity is candela
* Symbol of candela is Cd
* Dimension of Luminous Intensity is Cd


Out of the above said 7 fundamental physical quantities,length,mass and time plays vital role in Astronomy.

PHYSICS & ASTRONOMY

                
               Physics is the subject which deals about nature and hidden facts in nature.it has got so many branches and one of the fabulous branches of physics is Astronomy.

Dispersion of Prism

              

                Astronomy is theoritical study about universe(s) and the objects present in universe(s) by observations through astronomical devices like telescopes,binoculars,
observatories etc.,

           

    Analytical study about astronomy is Astrophysics using mathematical solutions.

 To learn Astronomy,Physics and Mathematics are important subjects to be known.