Question

3. Which of these is not related to a pendulum? a. Bob
b. String C. Time period
d. Sundial​

Answer 1

d) sundial is not related to pendulum

Answer 2

Explanation:

The correct option is d. Sundial

As if we see the figure Bob and string are the part and time period means the no. of times the string moves in 1 second.

Whereas,

The oldest known instrument for telling time, the sundial, allows us to track the position of the sun more accurately. Up until the early 19th century sundials were the main instrument people used to tell time. If they are correctly placed, sundials can be used to accurately tell time down to the minute!