A stationary sound wave is produced in a measuring cylinder by blowing across the top, as shown. Which statement is correct?
- AThe fundamental frequency of the stationary wave decreases when some water is added to the cylinder.
- BThe stationary wave in the cylinder is caused by the superposition of two waves moving in opposite directions.
- CThe stationary wave in the cylinder is polarised.
- DThe stationary wave will have an antinode at the bottom of the cylinder.