Please enable JavaScript.
Coggle requires JavaScript to display documents.
1.4 Size, Scale and Estimations and 1.5 Units and Standard Form - Coggle…
1.4 Size, Scale and Estimations and 1.5 Units and Standard Form
Common Calculations
Magnification of a light microscope: magnification of the eyepiece lens * magnification of the objective lens
Size of an object: size of image/magnification = size of object (this formula can be rearranged to obtain the other values, make sure you are in the same units!)
Standard Form
Through multiplying a certain number by a power of 10, it can get bigger or smaller
To be able to compare the size of numbers while using standard form, the ‘number’ which being multiplied by a power of 10 needs to be between 1 and 10
-
When working with calculations, it is common to come across very large or small numbers
-
Orders of Magnitude
-
-
Cells and organelles are extremely small, and we can use orders of magnitude to understand how much bigger or smaller one is from another
-
-
Estimations
Example
-
The entire field measures 50m 50m, so it fits 50 of the 1m 1m squares
-
Remember that 750 is just an estimate - the real number will likely be different! The more squares we look at (or ‘sample’) the closer we will get to the real number
We can estimate the number of dandelions in the whole field by multiplying that number by however many 1m x 1m squares can fit in the field
Estimations are useful in Biology when we don’t know how many of something there is, or if it would take too long to count. For example, if we take a 1m * 1m square sample of grassland and count the number of a particular species of plant (e.g dandelions) in that square