Kundt's Tube

Pick an option to see whether it holds. If one of them stops you, the theory page is two steps back.

1. 01

   Kundt's tube experiment is used to determine:

   • a) Speed of light
   • b) Velocity of sound in a gas and in a solid rod
   • c) Wavelength of light
   • d) Frequency of a tuning fork
2. 02

   The powder used inside Kundt's tube to observe dust patterns is usually:

   • a) Iron filings
   • b) Lycopodium powder (or fine cork dust)
   • c) Chalk powder
   • d) Sand
3. 03

   The dust particles inside Kundt's tube collect into heaps at the:

   • a) Nodes of the stationary wave pattern
   • b) Antinodes of the stationary wave pattern
   • c) Midpoint of the tube only
   • d) Open end of the tube only
4. 04

   The vibrations in the metal rod of Kundt's tube apparatus are typically produced by:

   • a) Striking the rod with a hammer
   • b) Rubbing the rod with a rosined cloth (or using electromagnetic or piezoelectric excitation) to set up longitudinal vibrations
   • c) Blowing air across the rod
   • d) Heating the rod
5. 05

   In Kundt's tube, resonance occurs when the frequency of vibration of the rod becomes equal to the:

   • a) Natural frequency of the gas column in the tube
   • b) Frequency of the powder particles
   • c) Frequency of ambient noise
   • d) Frequency of the light source
6. 06

   The distance between two consecutive dust heaps (nodes) in Kundt's tube corresponds to:

   • a) One full wavelength
   • b) Half the wavelength of the stationary wave in the gas
   • c) Quarter wavelength
   • d) Twice the wavelength
7. 07

   In the relation V_rod / V_gas = l_rod / l_gas, the lengths l_rod and l_gas represent:

   • a) Length of the tube and diameter of the rod
   • b) Distance between nodes in the rod and distance between dust heaps in the gas column
   • c) Total length of apparatus and wavelength of light
   • d) Radius of rod and radius of tube
8. 08

   If Kundt's tube is filled with a gas of lower density than air, all else constant, the wavelength of the stationary wave pattern in the gas will:

   • a) Decrease
   • b) Increase
   • c) Remain unchanged
   • d) Become zero
9. 09

   The rod used in Kundt's tube experiment is typically clamped at its:

   • a) One end only
   • b) Both ends
   • c) Middle point
   • d) Nowhere; it is left completely free
10. 10

    Kundt's tube experiment demonstrates which physical phenomenon most directly?

    • a) Interference of light waves
    • b) Formation of longitudinal stationary (standing) waves and resonance
    • c) Diffraction of sound waves
    • d) Doppler effect