Question

Use F = 1/T as your basis:

Answer 1

• Time=T=8×10^-5s

Now

$\\ \rm\rightarrowtail \nu=\dfrac{1}{T}$

$\\ \rm\rightarrowtail \nu=\dfrac{1}{8\times 10^{-5}}$

$\\ \rm\rightarrowtail \nu=0.125(10^5)$

$\\ \rm\rightarrowtail \nu=12500s^{-1}$

$\\ \rm\rightarrowtail \nu=12500Hz$