Question

In the case of an oscillating simple pendulum if the air resistance is taken into consideration, then

• A. amplitude of oscillation remains the same
• B. frequency remains the same
• C. the resultant acceleration remains the same
• D. All the above

Answer 1

The correct option is B frequency remains the same

Air resistance only decreases the amplitude of oscillation and decreases the linear acceleration of the pendulum.
Time period $=2\pi \sqrt{\frac{l}{g}}$
Frequency is only dependent on length of the pendulum and the acceleration due to gravity which don't change with time.