Question

Which of the following voices is likely to have the minimum frequency?
A) Voice of woman
B) Voice of baby girl
C) Voice of baby boy
D) Voice of a man

Answer 1

Hint: Sound frequency has direct relation with the sound pitch. Whose pitch is low means its frequency is also low and if pitch is high then frequency is also high. So by pitch we can answer it.

Complete step by step answer:
Sound is a mechanical unsettling influence from a state of equilibrium that propagates through a versatile material medium. Sound is that what is heard when sound waves go through a medium to the ear. All sounds are made by vibrations of particles through which the sound travels. For instance, when a drum is struck, the item vibrates. These vibrations make air particles move.
Sound can be of various sorts—soft, loud, lovely, disagreeable, melodic, perceptible implies that can be heard, imperceptible that can't be heard, and so forth A few sounds may fall into more than one class. For instance, the sound created when a plane takes off is both loud just as unpleasant.
Sound frequency is the speed of the sound's vibration which decides the pitch of the sound. The units of frequency are called hertz (Hz). People with ordinary hearing can hear sounds between 20 Hz and 20,000 Hz.
The vibe of a frequency is regularly alluded as the pitch of a sound. A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave. So frequencies of around 3000 Hz are considered as high pitch sound.
In the above question man has the lowest pitch so it has lowest frequency.
Option D is correct.

Note: As we see pitch of sound has a direct relation with sound means if one increases then other one also increases and if one decreases other one also decreases. Hence in such problems try to establish a relationship between known(pitch) and unknown quantity(frequency) and then answer depending on their relationship(direct or inverse).