Question

Which of the following statements is NOT correct?
A. Loudness of sound is determined by the amount of energy received by the ear per unit time.
B. Pitch doesn’t depend upon the amount of energy.
C. Loudness changes with change of frequency.
D. Pitch changes with change in frequency.

Answer 1

Hint: In this question use the basic properties of sound that are pitch, loudness and tone and also follow its characteristics that are amplitude, frequency, wavelength and timbre.

Complete Step-by-Step solution:
Sound is a wave. More specifically, sound is defined to be a disturbance of matter that is transmitted from its source outward. A disturbance is anything that is moved from its state of equilibrium. Some sound waves can be characterized as periodic waves, which means that the atoms that make up the matter experience simple harmonic motion.
The characteristics of sound waves are that it is produced by the periodic disturbance at a point in the medium. The particles vibrate about their mean positions and do not actually travel with the wave. Energy is transferred with a constant speed from one place of medium to the other place . It travels in the form of compression and rarefaction.
Hence, among all of the above options only loudness changes with frequency is the wrong statement as loudness doesn’t change with the change of frequency.

Note: A sound is a form of energy , just like electricity , heat or light. When you strike a bell, it makes a loud ringing noise. Now instead of just listening to the bell, put your finger on the bell after you have struck it. Then there is a moment of shaking i.e. the to and fro motion of the body is termed as vibration. The compression and expansion create a minute pressure difference that we perceive as sound. Hence among all the options the loudness changes with the change of frequency is wrong.