Assertion (A): The buzzing of a mosquito is shriller than the roar of a lion.
Reason (R): The frequency of sound produced by a mosquito is greater than the frequency of sound produced by the roar of a lion.
- (a)(A) is true but (R) is false.
- (b)(A) is false but (R) is true.
- (c)Both (A) and (R) are true and (R) is the correct explanation of (A).
- (d)Both (A) and (R) are true but (R) is not the correct explanation of (A).
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Both (A) and (R) are true and (R) is the correct explanation of (A).
Explanation
Assertion (A) is correct: The buzzing of a mosquito is a shrill, that is, a high pitched sound, whereas the roar of a lion is a low pitched sound. The roar is much louder than the buzz, but loudness depends on the amplitude of the sound wave, while shrillness depends on its pitch.
Reason (R) is also correct: A mosquito vibrates its wings very rapidly and therefore produces a sound of high frequency, while the roar of a lion is produced by the slower vibration of its vocal cords and is of low frequency.
Since the shrillness, or pitch, of a sound is decided by its frequency — the greater the frequency, the shriller the sound — the higher frequency of the mosquito is exactly the cause of its sound being shriller.
Therefore, both (A) and (R) are true and (R) is the correct explanation of (A).