Final answer:
When Noah decreases the length of the string by a factor of three, the frequency of the pendulum will increase.
Step-by-step explanation:
The frequency of the pendulum is inversely proportional to the length of the string.
When Noah decreases the length of the string by a factor of three, the frequency of the pendulum will increase. This is because a shorter string will have a higher frequency of oscillation compared to a longer string.
For example, let's say the original length of the string is L and the frequency is f. When the length is decreased to 1/3 L, the new frequency will be 3f.