COMPASSLearning
RegisterLogin

JEE Advanced · 2007 · 08 Apr 2007 · Paper 2 · Waves & Sound

WhatsApp Email
In the experiment to determine the speed of sound using a resonance column,
(A) prongs of the tuning fork are kept in a vertical plane
(B) prongs of the tuning fork are kept in a horizontal plane
(C) in one of the two resonances observed, the length of the resonating air column is close to the wavelength of sound in air
(D) in one of the two resonances observed, the length of the resonating air column is close to half of the wavelength of sound in air
  1. (A)(A) prongs of the tuning fork are kept in a vertical plane✓ Correct
  2. (B)(B) prongs of the tuning fork are kept in a horizontal plane
  3. (C)(C) in one of the two resonances observed, the length of the resonating air column is close to the wavelength of sound in air
  4. (D)(D) in one of the two resonances observed, the length of the resonating air column is close to half of the wavelength of sound in air

Answer: (A)

Solution

In a resonance column experiment, the tuning fork prongs must be kept in a vertical plane so that the vibrations are perpendicular to the tube opening, ensuring maximum coupling of sound energy into the air column. If kept horizontal, the vibrations would be parallel to the tube axis and would not efficiently excite the air column.

Regarding the resonance lengths: at the first resonance, the air column length is approximately λ/4 (plus end correction), and at the second resonance, it is approximately 3λ/4. Neither is close to λ or λ/2 as stated in options (C) and (D).

Therefore, only option (A) is correct.

JEE Advanced · 2007 · 08 Apr 2007 · Paper 2 · Single correct option

Practise more: all JEE Advanced PYQs on Waves & Sound →

More JEE Advanced questions on Waves & Sound

  1. List-I shows four configurations made of straight and semi-circular narrow tubes containing air. A sound wave of wavelength enters these structures at the point and a sound detector is placed at . Between the points and , the sound travels …
    JEE Advanced 2026View solution →
  2. Consider a system of three connected strings, and with uniform linear mass densities , and , respectively, as shown in the figure. and …
    JEE Advanced 2025View solution →
  3. An audio transmitter (T) and a receiver (R) are hung vertically from two identical massless strings of length 8 m with their pivots well separated along the axis. They are pulled from the equilibrium position in opposite directions along the axis by a small angular am …
    JEE Advanced 2025View solution →
  4. Two uniform string of mass per unit length and , and length and , respectively, are joined at point O, and tied at two fixed ends P and Q, as shown in the figure. The strings are under a uniform tension T. If we define the frequency …
    JEE Advanced 2024View solution →
  5. A source (S) of sound has frequency 240 Hz. When the observer (O) and the source move towards each other at a speed with respect to the ground (as shown in Case 1 in the figure), the observer measures the frequency of the sound to be 288 Hz. However, when the observer and t …
    JEE Advanced 2024View solution →
  6. A string of length 1 m and mass is under tension T . when the string vibrates, two successive harmonics are found to occur at frequencies 750 Hz and 1000 Hz. The value of tension T is ____ Newton.
    JEE Advanced 2023View solution →