A loudspeaker in a room is emitting music. The door into the room is open, and its width is $0.80\,\text{m}$. Sound waves of a range of frequencies travel through the opening and diffract. The speed of sound in air is $340\,\text{m s}^{-1}$. Which sound-wave frequency will diffract the most as it goes through the doorway?
- A$2.4 \times 10^{-3}\,\text{Hz}$
- B$8.0 \times 10^{-1}\,\text{Hz}$
- C$2.7 \times 10^{2}\,\text{Hz}$
- D$4.3 \times 10^{2}\,\text{Hz}$