Class 11Physics1 Thermal Properties of Matter: Thermometry, Expansion and CalorimetryThermal Expansion for Solid
MediumTwo rods,one of aluminum and the other made of steel,having initial lengths $l_1$ and $l_2$ are connected together to form a single rod of length $l_1 + l_2$. The coefficients of linear expansion for aluminum and steel are $\alpha_a$ and $\alpha_s$ respectively. If the length of each rod increases by the same amount when their temperature is raised by $t ^\circ C$,then find the ratio $\frac{l_1}{l_1 + l_2}$.
- A$\frac{\alpha_s}{\alpha_a}$
- B$\frac{\alpha_a}{\alpha_s}$
- C$\frac{\alpha_s}{\alpha_a + \alpha_s}$
- D$\frac{\alpha_a}{\alpha_a + \alpha_s}$
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