Which of the following will reduce the frequency of oscillation of a simple pendulum?

Answer Details

Increasing the length of the string will reduce the frequency of oscillation of a simple pendulum.
The frequency of oscillation of a simple pendulum is given by the formula:
f = 1/(2π) √(g/L)
where f is the frequency, g is the acceleration due to gravity, and L is the length of the pendulum.
As we can see from this equation, the frequency of oscillation is directly proportional to the square root of the acceleration due to gravity and inversely proportional to the square root of the length of the pendulum. Therefore, increasing the length of the pendulum will decrease the frequency of oscillation.
The mass of the bob and the amplitude of oscillation do not affect the frequency of oscillation, as long as they remain small. The mass of the bob and the amplitude of oscillation affect the period of oscillation, which is the time taken for one complete oscillation.