Which of the following statements is/are true about the loudness and softness of a sound wave? (i) A loud sound has less amplitude as compared to a soft sound. (ii) A loud sound has more energy associated with it as compared to a soft sound. (iii) The loudness of a sound wave is the measure of the response of the ear to the sound.
Both (ii) and (iii)
The loudness of a sound is determined by the amplitude of the sound wave — the larger the amplitude, the louder the sound, and vice versa.
Statement (i): 'A loud sound has less amplitude' is FALSE — it is the opposite; loud sound has more amplitude.
Statements (ii) (a loud sound has more amplitude than a soft sound) and (iii) (louder sounds carry more energy per unit time) are both TRUE. The candidate chose D (both i and ii) but since (i) is false, the correct answer is : Both (ii) and (iii).
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