A Pendulum Clock Uses a Simple Pendulum as Its Timing

Multiple Choice

A pendulum clock uses a simple pendulum as its timing device. The clock is correct at noon. The next day, when the clock reads noon, the actual time is 11:50 a.m. What is the fractional change in pendulum length that must be made so the clock runs at the correct rate?

A) 1.40% longer
B) 16.7% longer
C) 0.699% longer
D) 0.699% shorter
E) 2.84% longer