Question

A teacher has four rods that are identical except that each is made from a different material. He paints 1 cm bands on the rods using a paint that changes color when it is heated. The paint is red when cool but changes to clear at 47°C. Describe how the teacher should perform this investigation. You should include details of measurements taken. (4 points)

A) Measure initial rod temperature.
B) Apply uniform heat to each rod.
C) Record time for color change.
D) Measure final rod temperature.

Answer 1

To perform the investigation, the teacher should measure the initial temperature of each rod, apply heat, record the time for color change, and measure the final rod temperature.

Step-by-step explanation:

To perform the investigation, the teacher should follow the following steps:

1. Measure the initial temperature of each rod using a thermometer.
2. Apply uniform heat to each rod, such as heating them in a controlled environment like an oven.
3. Record the time taken for the color change to occur on each rod, starting from when the rods are heated.
4. Measure the final temperature of each rod after the color change occurs.

By following these steps, the teacher can determine at what temperature the paint on each rod changes color, which will provide information about the thermal properties of the materials used to make the rods.