Input an expression for the temperature, ( t₂ ), at which the resistance of a particular wire will be twice as high as it is at the reference temperature, ( t₀ ). (Both temperatures are in degrees Celsius.)
a) ( t₂ = 2t₀ )
b) ( t₂ = √2t₀ )
c) ( t₂ = t₀² )
d) ( t₂ = t₀/2 )