Physics
Assertion (A) : Loudness and quality of sound are independent of each other.
Reason (R) : Loudness depends on amplitude while quality of sound depends on the waveform of sound.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Sound
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Answer
Both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because loudness and quality (or timbre) of sound are independent properties and changing one does not necessarily affect the other.
Reason (R) is true because loudness depends on the amplitude of the sound wave such that greater amplitude means louder sound and quality depends on the waveform or the shape of the sound wave, which is influenced by the mixture of frequencies.
So here reason correctly explains why the loudness and the quality of sound are independent of each other.
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Related Questions
Pitch of a note depends on :
- amplitude
- loudness
- frequency
- waveform
Assertion (A) : To make a shrill sound in a flute, holes are opened.
Reason (R) : The holes are opened to increase the length of the vibrating air column.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Fill in the blanks:
(a) The time period of a wave is 2 s. Its frequency is …………… .
(b) The pitch of a stringed instrument is increased by …………… tension in string.
(c) The pitch of a flute is decreased by …………… length of air column.
(d) Smaller the membrane, …………… is the pitch.
(e) If a drum is beaten hard, its loudness …………… .
(f) A tuning fork produces sound of …………… frequency.
Write true or false for each statement:
(a) When sound propagates in air, it does not carry energy with it.
(b) In a longitudinal wave, compression and rarefaction are formed.
(c) The distance from one compression to nearest rarefaction is called wavelength.
(d) The frequency is measured in second.
(e) The quality of a sound depends on the amplitude of wave.
(f) The pitch of sound depends on frequency.
(g) Decibel is the unit of pitch of a sound.