Question

the period of a mechanical wave is 12 seconds what is the frequency of the wave 12 waves/seconds 4.0 waves/seconds 0.083 waves/seconds PLEASE HELP I REEEEEALLY NEED IT

Answer 1

Hello!

Data:

T (period) = 12 s

f (frequency) = ? (waves/second)  

Formula:

$f = \dfrac{1}{T}$

Solving:

$f = \dfrac{1}{T}$

$f = \dfrac{1}{12}$

$\boxed{\boxed{f \approx 0.083\:waves/second}}\end{array}}\qquad\quad\checkmark$

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I Hope this helps, greetings ... Dexteright02! =)

Answer 2

Use your units ! 
"Period" is time . . . 12 seconds.
"Frequency" how often . . . " ___ PER time".  Time is in the denominator.

"12 seconds per wave" means 

                                    1 wave / 12 seconds

                             =      (  1 / 12 )  (wave/second)

                             =            0.08333... wave per second

                             =            1/12  Hz.