Final answer:
The positions where a sound source is equidistant from both ears are directly in front of and directly behind the listener, corresponding to 0° and 180°, respectively. The answer is (b) 45°, 180°, and this concept is essential for sound localization.
Step-by-step explanation:
If a sound source is located anywhere other than the 0° or 180° degree point, it must be closer to one ear than the other. The correct answer to this question is (b) 45°, 180°. This question pertains to the subject of sound localization, which is the process used by the brain to determine the origin of sounds based on the interrautal time difference and interrautal intensity difference. Sound localization is a critical feature of our auditory perception, enabling us to detect the direction from which a sound originates. The specific angles mentioned, 0° and 180°, correspond to directly in front and directly behind a listener, respectively, where a sound would arrive at both ears simultaneously. At any other angle, the sound will reach one ear before the other, helping us to locate its source.