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Rev. Notes > IGCSE > Length and time
 
 
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Topics
 

Physical quantities

Conversion of units

Length

Length-Measurement Micrometer Micrometer - Pitch
Micrometer - Least count Micrometer - Zero error Micrometer - Data Table
Time Multiples / submultiples of time Stop-clock
Standard form Parallalax error Simple pendulum
Amplitude of simple pendulum Time period of simple pendulum Frequency of simple pendulum
 

Time

The S.I. unit of time is second. 

Initially a second was taken as 1/86400 of a mean solar day of the whole year of 1900 AD.

In the General Conference on Weight and Measure in 1967 the second was redfined as "the time interval taken by 9192631770 vibrations of cesium-133 atom under specified condition".

 
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View Comments on this Chapter - Total Comments (12)
 
Sarika Said :
out put is given in the book which u have copied.so it was not useful.
 
  06/05/17 06:20 AM
   
yo mama Said :
well it is informative but out of date but otherwise helpful
 
  30/03/16 09:56 PM
   
Edward Said :
Very good helped me so much!!!
 
  14/03/15 02:30 PM
   
Cara Delivingne Said :
This website is very helpful. However, there are still a few changes you can make to it, now that the syllabus has completely been modified. Thank you for your notes though! Xx
 
  11/12/14 08:34 PM
   
zuhi Said :
where are the SI units,symbols,Prefixes,and diagrams ?
 
  27/09/14 09:05 AM
   
ghost Said :
bluffmaster u will find past papers at www.xtremepapers.com
 
  22/09/14 11:12 AM
   
Daisy Said :
I like ur comment Muffin :)
 
  15/02/14 12:05 PM
   
Bluffmaster Said :
Good informative. But no past papers, no experiments. This is not IGCSE! You should improve this site.
 
  15/02/14 12:04 PM
   
bituu darak Said :
Good information try to give all round info for vernier calliper and other important Info
 
  05/09/13 11:29 AM
   
Muffin Said :
This is a very nice website and no one should be saying anything about it and ppl who do say bad things they are dummasses
 
  16/07/13 11:50 AM
   
whatever Said :
you are wierd dumbass
 
  08/05/12 10:46 PM
   
shaheer salim Said :
there s a mistake its 1cm(square) = 100 mm(square)
 
  01/03/12 01:04 AM
 

 

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