The frequency of a wave is the inverse of the wave's
velocity
wave length
amplitude
velocity

This is a beautiful example of how you can identify an answer
just by looking at the units, and nothing else.

Frequency of a wave is its 'often-ness' ... how often it wiggles,
how many of them per second.  The unit is 'per second' or 1/sec .
That's the unit called "Hertz".

What is it the inverse of ?        It's the inverse of "second".

Test the choices to find one that has the units of "second":

Velocity (actually speed) . . . meters/second . . . . . No.
Wavelength . . . . . meters . . . . . No.
Amplitude . . . . . volts, or meters, or some pressure . . . . . No.
Velocity (actually speed) . . . . . meters/second . . . . . Still No.

None of these choices has the units of inverse frequency.
The correct answer is "period" ... the length of time each wiggle takes.
It's not even on the list here !

Answer

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

explanation

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force