Final answer:
In the equation ΔL = a × L × ΔT, 'a' represents the coefficient of linear expansion, which quantifies how much a material expands with temperature change. correct option is 4. The change in temperature
Step-by-step explanation:
In the equation ΔL = a × L × ΔT for thermal expansion, the variable 'a' represents the coefficient of linear expansion. This coefficient is a material property that indicates how much a material will expand per unit length per degree change in temperature. The coefficient of linear expansion, 'a', varies slightly with temperature but is often considered a constant for practical calculations.
In the equation deltaL = a * L * deltaT for thermal expansion, the variable 'a' represents the coefficient of linear expansion. This coefficient is a material property that describes how a material expands or contracts with changes in temperature.
It is a constant value that varies slightly with temperature, and it determines the amount of change in length (deltaL) for a given change in temperature (deltaT) and initial length (L).
correct option is 4. The change in temperature