- What is the audible range of human hearing?
- Answer: 20 Hz – 20 kHz
- Explanation: The human ear can detect sounds with frequencies between 20 Hz and 20,000 Hz.
- Which sound waves have frequencies below 20 Hz?
- Answer: Infrasound
- Explanation: Sound waves with frequencies lower than 20 Hz are called infrasound and are inaudible to humans.
- Which sound waves have frequencies above 20,000 Hz?
- Answer: Ultrasound
- Explanation: Sound waves with frequencies higher than 20,000 Hz are called ultrasound and are used by animals like bats and dolphins.
- Which animal can hear frequencies up to 25 kHz?
- Answer: Dog
- Explanation: Dogs can hear frequencies up to 25 kHz, beyond the human hearing range.
- Which large land animal uses infrasound for communication?
- Answer: Elephant
- Explanation: Elephants produce and detect infrasound at frequencies as low as 5 Hz for long-distance communication.
- Which natural disaster is often preceded by infrasound signals?
- Answer: Earthquake
- Explanation: Earthquakes generate low-frequency infrasound, which some animals can detect before the main shock waves.
- Which marine animal uses ultrasound for navigation?
- Answer: Dolphin
- Explanation: Dolphins use ultrasound for echolocation to detect objects underwater.
- Which flying mammal uses ultrasound to detect prey?
- Answer: Bat
- Explanation: Bats rely on ultrasound to locate prey and navigate in the dark using echolocation.
- Which category of sound waves is used in medical imaging?
- Answer: Ultrasound
- Explanation: Ultrasound is used in medical imaging techniques like ultrasonography to visualize internal organs.
- What happens to human hearing sensitivity as people age?
- Answer: Decreases
- Explanation: As humans age, their ears become less sensitive to higher frequencies, reducing the upper limit of their hearing range.
