Question

Voices of men, Women and children are different because of:
A. pitch
B. the length and the thickness of vocal cords.
C. both
D. none

Answer 1

Frequency: Frequency is the number of events occurring in the time. Frequency is also called a cycle or repetition. SI unit of frequency is Hertz (Hz). The mathematical formula of frequency is:
$f = \dfrac{1}{T}$
f= frequency
T = time

Complete step by step answer:
Pitch: Pitch is defined as the characteristics of sound which is used for differentiating between the shrill and the flat sound. Pitch is totally dependent on the frequency, higher the frequency the shrillness is increased. And pitch is the most essential factor to determine the voice of an individual. Pitch is independent of energy. A high sound has a high pitch and low sound has low pitch.
Vocal cords: Vocal cords or voice reeds are the bands of muscle in the back of your throat that moves to produce the sound. Vocal cords are the reason for differentiating the sound of the individual, the higher the length there is less frequency so there is low shrillness. Shorter the length, more frequency and hence more shrill.
The length of the vocal cords of men is 20 mm long.
The length of vocal cords of women is 5mm long.
The length of the vocal cords of children is very short.
From the above data this is clear that the length of each is different so the sound produced by individuals are different and identical.

So, the correct answer is “Option C”.

Note: The audible frequency for the human ear is 20Hz- 20000Hz. Sound waves are longitudinal waves so they are vibrating in nature when they travel from one place to another.