The limit of audibility for healthy human is :

Question

Accepted Answer

The limit of audibility for healthy humans is defined as the range of sound frequencies that can be heard by the average person. This range is crucial for understanding human hearing capabilities and is widely accepted in scientific and medical communities.

1. **Explanation for Option 3 (20 Hz to 20000 Hz):**
   - The human ear is capable of detecting sound frequencies from approximately 20 Hz to 20,000 Hz. This range is known as the audible range for humans. Sounds below 20 Hz are referred to as infrasound, and those above 20,000 Hz are called ultrasound. Both infrasound and ultrasound are not typically audible to humans without the aid of specialized equipment.
   - The lower limit of 20 Hz is the threshold at which humans begin to perceive sound as a low rumble, while the upper limit of 20,000 Hz is where sounds become too high-pitched for the human ear to detect. This range can vary slightly among individuals, especially with age, but 20 Hz to 20,000 Hz is the standard range for healthy young adults.

2. **Explanation for why other options are incorrect:**
   - **Option 1 (10 Hz to 20000 Hz):** While the upper limit of 20,000 Hz is correct, the lower limit of 10 Hz is incorrect. Humans generally cannot hear sounds as low as 10 Hz without assistance, as this falls into the infrasound category.
   - **Option 2 (10 Hz to 2000 Hz):** This range is incorrect because it significantly underestimates the upper limit of human hearing. While the lower limit of 10 Hz is also incorrect, the upper limit of 2000 Hz is far too low, as humans can hear frequencies up to 20,000 Hz.
   - **Option 4 (20 Hz to 200000 Hz):** The lower limit of 20 Hz is correct, but the upper limit of 200,000 Hz is incorrect. Humans cannot hear frequencies as high as 200,000 Hz, as this is well into the ultrasonic range, which is beyond human auditory perception.

In conclusion, Option 3 (20 Hz to 20000 Hz) accurately represents the range of frequencies that a healthy human ear can detect, making it the correct answer.