Experiment of December 15, 2017:

The time to submit an answer is over. You can now view the solution of the experiment.

Solution video:

Experiment:

Question:

What does he notice, when he releases after 20-30 seconds the rubber band quickly and again holds it briefly to his lips?

A) When stretching the rubber band, it becomes warm and then cools as it contracts.

B) When stretching the rubber band, it becomes cold and warms up as it contracts.

C) The rubber band gets cold as it is stretched and as it contracts.

D) The rubber band gets warm as it is stretched and as it contracts.