A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s. Option 1) 12 Option 2) 8 Option 3) 6 Option 4) 4

As discussed in @7270

$\frac{\lambda}{4}=0.85\:\:\:\:\:\lambda=4 \times 0.85=100 Hz$

$\therefore$ Possible frequencies= 100 Hz, 300 Hz, 500 Hz, 700 Hz, 900 Hz, 1100 Hz, below 1250 Hz

Option 1)

12

This option is incorrect.

Option 2)

8

This option is incorrect.

Option 3)

6

This option is correct.

Option 4)

4

This option is incorrect.

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