What is the difference in arrival time between left and right ears, for a sound that comes from the listener's left? If the sound comes from directly in front of the listener? Calculate the difference in arrival time between the left and right ears for a sound that comes from 30˚ off-axis (for example, if the sound comes from the northwest when the listener is facing north). Take the distance between left and right ears as 0.2 m, and the distance from the source to the center of the listener's head (exactly halfway between the ears) as 1.0 m. Take the speed of sound as 343 m/s.