Question

Which are the most important properties of stand?
(A) Amplitude
(B) frequency
(C) loudness
(D) Both A & B

Answer 1

The two most important properties of sound are amplitude and frequency because amplitude determines the loudness of sound and frequency determines its pitch.

Complete answer:
Sound waves are often simplified to a description is terms of sinusoidal plane waves, which are characterized by these generic properties:-
Frequency or its inverse wavelength
Amplitude, sound pressure or intensity
Speed of sound
Direction
So from above we can conclude that amplitude and frequency both are the important properties of sound.

Therefore option (D) both A and B is the correct answer.

Although there are many complexities relating to the sound, it is readily divisible into two simple elements pressure and time. These are fundamental elements from the basis of all the sound waves. They can be used to describe, in absolute terms, every sound we hear.

Additional information:
Humans normally hear sound frequencies between approximately 20 Hz to 20,000 Hz. Sometimes sound refers to only those vibrations with frequencies that are within the hearing range for humans. As a signal perceived by one of the major senses, Sound is used by many species for detesting danger, navigation predation and communications. Earth’s atmosphere, water and virtually any physical phenomenon such as fire, rain, wind, surf or earthquake produce its unique sounds. Noise is a term often used to refer to an unwanted sound. There are historically six experimentally separable ways in which sound waves are analysed.

Note:
Pitch is perceived as how low or high a sound is and represents the cyclic, repetitive nature of the vibrations that make up sound. For simple sounds, pitch relates to the frequency of the slowest vibrations in the sound. In the case of complex sounds, pitch perception can be varied. The energy carried by an oscillating sounds wave converts back and forth between the potential energy of the extra compression or the lateral displacement strain of the matter, and the kinetic energy of the displacement known as shear waves, have the additional property, polarization, and are not a characteristics of the sound waves.