The period T of a pendulum is given by:

where L is the length of the pendulum while

is the gravitational acceleration.
In the pendulum of the problem, one complete vibration takes exactly 0.200 s, this means its period is

. Using this data, we can solve the previous formula to find L:
Answer:D increase in frequency
Explanation:
The loudness of sound refer to how loud or soft a sound seems to a listener
Answer:
The number of protons can be found by looking at the atomic number
Explanation:
Its at the very top of the little element box