Question

what should be the temperature rise of a brass rod,its coefficient of linear expansion is 2×10 to the power of -5 degree celcius inverse so as to increase its length by 1%.

Answer 1

Thermal expansion coefficient α is defined by 
 
     ΔL = α * L * ΔT,      where α = coefficient of linear thermal expansion
                       L = length of substance,    ΔT = change in temperature.

     (ΔL / L) * 100 = 100 * α * ΔT

    ΔT  = 1 / (100 * 2 * 10⁻⁵) = 500°C
 

Answer 2

you can get the answer on Google