Resonance Column Viva Questions

Resonance Column Viva Questions and Answers

(i) What are stationary waves?

Ans: When two waves of the same frequency and amplitudes travel in opposite directions along a straight line at the same speed, their super position gives rise to stationary waves

(ii) What are nodes and antinodes?

Ans: Node is a position of zero displacement and antinode is a position of maximum displacement

(iii) In a stationary wave what is the distance between successive nodes?

Ans: λ/2, where λ is the wave length.

(iv) What is end correction or edge effect?

Ans: The antinode at the open end of a tube is formed slightly out side the open end. The distance from the open end to the antinode is called end correction e = 0.3d where d is the diameter of the pipe

(v) What is meant by resonance?

Ans: When two notes of the same frequency are sounded together the intensity of sound is maximum and they are said to be in resonance or in unison

(vi) The experiment is called resonance column experiment why?

Ans: When we excite a tuning fork and hold it at the mouth of the tube at resonance the frequency of the air column and the frequency of the turning fork are equal. We obtain the frequency of the air column by resonance method

(vii) What is the effect of temperature on the velocity of sound in air?

Ans: The velocity of sound in air is directly proportional to the square root of temperature in Kelvin scale v T.

(viii) In a resonance column experiment what is the functions of water in the jar?

Ans: It only acts as an agent for closing the tube to make the tube a closed tube of easily variable length

(ix) What is meant by supersonic speed?

Ans. The speed greater than that of sound in air ie, 331 m/s at 0°C

(x) If we take kerosene oil in place of water in the resonance column experiment will the resonance position change?

Ans: Remains unchanged

(xi) Why is second resonance feebler than the first?

Ans: At second resonance the vibration in the air column corresponds to the first overtone which is very week

(xii) What type a waves you get in resonance column?

Ans: Longitudinal

(xiii) Is it necessary to have a tube of circular cross section?

Ans: Not necessary.

(xiv) Aim of Resonance Column experiment?

Ans: (a) To determine the velocity of sound in air at room temperature by the resonance column and hence to determine the velocity of sound in air at 0°C.
(b) To find the end correction.

(xv) Apparatus for the Resonance Column experiment?

Ans: Resonance column apparatus, tuning forks, rubber hammer etc. Resonance column apparatus includes a long metal tube erected vertically in a tall jar containing water. The tube can be set in any desired position. The length of the air column in the tube can be varied by stretching or lessening the tube.