Period equation, T=I/f, what does I mean

[rdcrdc11]

I am doing a home project for my Physical science concepts class. i need to find the period of a pendulum's swing. the prof. gave us the formula, T=I/f and tells us that T is the period, and f is the frequency of the swing, but doesn't say what I is. Does anyone know?

 

[Redbelly98]

Welcome to Physics Forums

"I" is really "1", i.e. the number one.

T = 1/f​

 

[rdcrdc11]

Thank you. :-)

 

[ideasrule]

It's important to understand equations intuitively. T=1/f can be rewritten as f=1/T. 1/T is the number of periods that can fit within 1 second of time. By definition, that's the frequency.