Q. A cylindrical tube containing air is open at both ends. If the shortest length of the tube for resonance with a given fork is 2 cm, the next shortest length for resonance with the same fork will be
A) 60 cm
B) 40 cm
C) 90 cm
D) 80 cm
Explanation
(b) As the tube is open at both ends, therefore, next shortest length for resonance $= 2 \times 20 = 40\ cm$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.