SATHEE: Wave Motion 2 Question 34

Wave Motion 2 Question 34

34. Velocity of sound in air is $320 m / s$ . A pipe closed at one end has a length of $1 m$ . Neglecting end corrections, the air column in the pipe can resonate for sound of frequency

$(1989, 2 M)$

(a) $80 H z$

(b) $240 H z$

(d) $400 H z$

Show Answer

Answer:

Correct Answer: 34. (a, b, d)

Solution:

For closed pipe, $f = n (\frac{v}{4 l}) n = 1, 3, 5 \dots$

For $n = 1, f_{1} = \frac{v}{4 l} = \frac{320}{4 \times 1} = 80 H z$

For $n = 3, f_{3} = 3 f_{1} = 240 H z$

For $n = 5, f_{5} = 5 f_{1} = 400 H z$

$∴$ Correct options are (a), (b) and (d).

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Wave Motion 2 Question 34

34. Velocity of sound in air is 320m/s. A pipe closed at one end has a length of 1m. Neglecting end corrections, the air column in the pipe can resonate for sound of frequency

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34. Velocity of sound in air is $320 m / s$ . A pipe closed at one end has a length of $1 m$ . Neglecting end corrections, the air column in the pipe can resonate for sound of frequency