In which of the following is a stationary wave produced?

i. A vibrating tuning 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

Correct Answer:

Option C – i and ii only