The question asks to identify the correct term for the outer ear. This requires knowledge of the basic anatomy of the human ear.
A) Pinna — The pinna is indeed the correct anatomical term for the outer, visible part of the ear that collects sound waves.
The question asks to identify the term for sound waves with a frequency below the audible range. This requires knowledge of the classification of sound waves based on their frequency and the human hearing range.
A) Infrasonic: Infrasonic waves are sound waves with frequencies below the lower limit of human audibility, typically less than 20 Hz. Examples include sounds produced by earthquakes, volcanoes, and large animals like elephants.
The question asks to identify the term for sound waves with frequencies above the audible range for humans. This requires knowledge of the classification of sound based on frequency.
Therefore, sound waves with frequencies above the audible range are known as ultrasonic waves.
Correct Option: B) Ultrasonic
| List I - Animals | List II - Audible Range |
| a) Bat | 1.) 9kHz to 200 kHz |
| b) Elephant | 2.) 16Hz to 12kHz |
| c) Dolphin | 3.) 40Hz to 150kHz |
The question asks to match animals with their respective audible frequency ranges. This requires knowledge of the hearing capabilities of different animals, particularly those known for using or perceiving ultrasonic or infrasonic frequencies.
Correct Option: C) a-1, b-2, c-3
To determine where sound cannot travel, we need to understand the nature of sound waves. Sound is a mechanical wave, meaning it requires a medium to propagate. This implies that sound travels by causing vibrations in the particles of a medium.
Correct Option: B) Vacuum
The question asks for the term used to describe sound within the audible range for humans. We need to recall the classification of sound waves based on their frequency ranges.
A) Sonic Sound is the term used to describe sound waves that fall within the human audible range, typically from 20 Hz to 20,000 Hz. This is the range of frequencies that the human ear can perceive.