Question

In the following sentence. say 'True' and 'False'
(a) Sound can't travel in vacuum (T/F)
(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)
(c) If the amplitude of vibration is large, sound is feeble. (T/F)
(d) For human ears, the audible range is 20Hz to 20,000Hz. (T/F)
(e) The lower the frequency of vibration, the higher is the pitch.
(f) Unwanted or unpleasant sound is termed as music. (T/F)
(g) Noise pollution may cause partial hearing impairment. (T/F)

A. TFTTFFT
B. TTFTFFT
C. TFFTFFF
D. TFFTFFT

Answer 1

Hint: The above problem can be resolved using the concepts of sound and its effect on various variables like amplitude, intensity, pitch, loudness, and many more, along with a significant relationship.

Complete step by step answer:
(a) To achieve the sound's propagation, the sound requires some medium, and vacuum is considered devoid of any medium. Hence sound cannot travel through it. Therefore the statement is true.
(b) The frequency means that the number of oscillations produced per second of the vibration of object and period is the time that is required to complete one complete oscillation. Hence, the statement is false.
(c) The variation of the sound's loudness occurs is proportional to the square of the vibration's amplitude. Thus, the sound is feeble for small amplitude, and the statement is false
(d) The audible range for the human being is 20 Hz to 20 kHz. Therefore, the statement is true.
(e) The sound's pitch is proportional to the frequency of sound, ass the frequency increases; the pitch of sound also increases. Hence the statement is false.
(f) The unpleasant sound is known as noise, and pleasant sound is known as music; hence, the statement is false.
(g) Unwanted and unpleasant sound is known as noise, and it may cause temporary hearing impairment if subject for a long time. Hence the statement is true.

So, the correct answer is “Option D”.

Note:
To resolve such problems, one must go through the learning of fundamentals of sound and its fundamentals with establishing the appropriate relationship in each other's context. Sound analysis has wider applications in the field of science.