1.

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1. C

2. a) 653.8Hz b) 326.9Hz

3. 64.9 cm

4. Wind can excite air oscillations in a chimney, much like in an organ pipe or flute. A chimney is a fairly long tube, acting like a tube open at both ends. Speed of wind v is 340m/s then, we find //f// as 56Hz, which is a fairly low note - no wonder chimneys "moan"!