A brass scale is graduated at `10^@C`. What is the true length of a zinc rod which measures 60.00 cm on this scale at `30^@C`?
Coefficient of linear expansion of brass`=18xx10^-6K^-1`.

Explanation

To find the true length of the zinc rod that measures 60.00 cm on a brass scale graduated at 10°C, we need to account for the thermal expansion of the brass scale due to the temperature difference. Here’s how to solve the problem step by step:

### Step 1: Identify the given values
- Measured length of the zinc rod (L') = 60.00 cm
- Temperature at which the scale is graduated (T₀) = 10°C
- Temperature at which the measurement is taken (T) = 30°C
- Coefficient of linear expansion of brass (α) = 18 × 10⁻⁶ K⁻¹

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