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ICSE Class 10 Physics Question 7 of 15

Solved 2022 Semester 2 Question Paper ICSE Class 10 Physics — Question 7

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7
Question

Question 4(i)

Rohit playing a flute and Anita playing a piano emit sounds of same pitch and loudness.

(a) Name one characteristic that is different for waves from the two different instruments.

(b) If now the loudness of the sound from flute becomes four times that of the sound from piano, then write the value of the ratio AF : AP (AF – amplitude of sound wave from flute, AP – amplitude of sound wave from piano)

(c) Define 'Pitch' of a sound.

Answer

(a) The characteristics is quality.

(b) Loudness (L) is proportional to the square of amplitude (A)

So,

LFLP\dfrac{\text{L}_F}{\text{L}_P} = AF2AP2\dfrac{\text{A}_F^2}{\text{A}_P^2}

Or, 41\dfrac{4}{1} = AF2AP2\dfrac{\text{A}_F^2}{\text{A}_P^2}

∴ AFAP\dfrac{\text{A}_F}{\text{A}_P} = 2:1

(c) Pitch is that characteristic of sound by which an acute (or shrill) note can be distinguished from a grave (or flat) note of same loudness.