# Question #5440f

##### 1 Answer

#### Answer:

A seconds pendulum is defined as a pendulum whose **time period** is **exactly equal to 2 seconds**.

#### Explanation:

Alternatively seconds pendulum has frequency equal to

If we ignore air resistance, and for small swings we know that, time for one complete oscillation of a pendulum

where

Therefore, length of Seconds pendulum

inserting standard

If someone asks you about a Seconds pendulum on moon, only answer is about its defined time period.