Answer:
the Fundamental Frequency of vibration of a wave is defined as that which has the lowest frequency
Step-by-step explanation:
As we know that the frequency of vibrations on a string is given as

now we know that
N = number of harmonics
v = speed of the wave
L = length of the string
So here for the lowest frequency of the wave we know that
N = 1
so lowest frequency of the wave is known as fundamental frequency of the wave
the Fundamental Frequency of vibration of a wave is defined as that which has the lowest frequency