The human ear is sensitive to a wide range of sound intensities. While the threshold of hearing is near 0 dB, prolonged exposure to sounds between 60 dB and 80 dB is generally considered the range where sound becomes noticeably loud and approaches the limit of comfortable tolerance before potential hearing damage occurs.

The speed of sound in water is significantly higher than in air due to the higher bulk modulus of water. At 20°C, the speed of sound in fresh water is approximately 1480 to 1500 meters per second, which is roughly four times faster than its speed in air at room temperature.

The human auditory system is capable of detecting sound waves within the frequency range of 20 Hz to 20,000 Hz. This specific range is defined as the audible frequency range. Frequencies below 20 Hz are called infrasonic, and frequencies above 20,000 Hz are called ultrasonic.

Infrasonic waves are sound waves with frequencies below the lower limit of human hearing, which is approximately 20 Hz. These low-frequency waves can travel long distances and are often produced by natural phenomena like earthquakes.

The speed of sound in oxygen at 25°C is approximately 330 m/s (or 19,800 m/min), and in water, it is approximately 1498 m/s (or 89,880 m/min). The values provided in the options are given in m/min, which are significantly lower than the actual physical constants, making both statements factually incorrect.

Acoustics is the branch of physics that investigates the production, transmission, and reception of sound waves. It encompasses various phenomena, including vibration, sound propagation, and the interaction of sound with different media. Other options like Aerodynamics and Aeroelasticity focus on fluid and structural interactions, while Etiology is a medical term for the study of disease causes.

The human auditory system is capable of detecting sound waves with frequencies ranging from approximately 20 Hz to 20,000 Hz. Frequencies below this range are classified as infrasonic, while those above this range are classified as ultrasonic. This specific range is defined as the audible spectrum for healthy human hearing.

The standard audible frequency range for humans is approximately 20 Hz to 20,000 Hz. Frequencies above 20,000 Hz are classified as ultrasonic and are generally inaudible to humans. Therefore, 22,000 Hz is outside the audible range.

The human ear is sensitive to sound frequencies ranging from approximately 20 Hz to 20,000 Hz. Sounds with frequencies below 20 Hz are known as infrasound. While humans generally cannot hear these low-frequency vibrations as distinct tones, they may sometimes be perceived as physical sensations or pressure changes depending on the intensity of the sound wave.

At night, the air near the ground is cooler than the air above it, causing sound waves to refract (bend) back toward the Earth's surface. This refraction keeps the sound energy concentrated near the ground, allowing it to travel further than during the day, when temperature gradients often cause sound waves to bend upward away from the ground.