In which of the following is a stationary wave produced? i. A vibrating turning fork held near the end of a resonance tube closed at one end. ii. A string tightly stretched between two points and plucked at its middle. iii. The tuning fork vibrating in air
-
A.
i only -
B.
ii only -
C.
i and ii only -
D.
ii and iii only -
E.
i, ii and iii