Explanation:
At room temperature, resistivity of tungsten is
and the resistivity of aluminium is
.
Temperature coefficient of aluminium (
) = 

and, 
= 
T = 
=
So, at
aluminium has resistivity which is three times the resistivity of tungsten at room temperature.
a region around a magnetic material or a moving electric charge within which the force of magnetism acts.
The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
<h3>What are radioactive elements?</h3>
Radioactive elements are elements that involved in radioactivity and this comprises of atoms or particles in their nuclei whose atomic nuclei are not stable and they emit radiations to maintain stability.
Therefore, The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
Learn more about radioactive elements below.
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