AP Physics 2 / Unit 14: Waves, Sound, and Physical Optics
14.2 Periodic Waves
Notes
$$v=f\lambda,\qquad T=\frac{1}{f}$$
- Wave speed depends on the medium, not on frequency.
- On a string: $\displaystyle v=\sqrt{\frac{F_T}{\mu}}$.
Practice
$f=10$ Hz, $\lambda=2$ m. $v=$
$f\lambda$.
Increasing frequency in the same medium makes wavelength:
$v$ is fixed.
Increasing string tension makes the wave speed:
$\displaystyle \sqrt{F_T/\mu}$.
Ready for more? Take the Unit 14 test.