The processes of internal and external conversion differ by the method of energy loss. Internal conversion exploits the degrees of freedom within the molecule, whereas external conversion dissipates energy by collisions with other molecules.
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internal and external memory
Well, honey, the external terms of a ratio are the first and last numbers in the ratio, while the internal terms are the second and third numbers. So if you've got a ratio like 2:5, the external terms are 2 and 5, and the internal terms are... you guessed it... 2 and 5. Math can be a real hoot, can't it?
The internal angles are 144 degrees. The external angles are 36 degrees.
180-135 = 45 degrees
A trapezium has 4 internal angles and 4 external ones, just like any other quadrilateral.