The video explores the heightened senses of animals, particularly their hearing abilities. It conducts an experiment to determine the human hearing range, establishing it as 20 Hertz to 20 kilohertz. The video explains sound frequencies, including infrasound and ultrasound, and discusses the applications of ultrasound in fields like machinery inspection and medical imaging. It highlights the use of ultrasound by animals for navigation and communication.

What is one reason dogs are considered to have heightened senses?

• They can fly.

• They can hear sounds that humans cannot.

• They can see in the dark.

• They can smell colors.

At what frequency does the human hearing range start?

• 20 Hertz

• 100 Hertz

• 50 Hertz

• 10 Hertz

What is the upper limit of the human hearing range?

• 25 kilohertz

• 20 kilohertz

• 15 kilohertz

• 10 kilohertz

What is the term for sound frequencies below 20 Hertz?

• Hypersound

• Supersound

• Infrasound

• Ultrasound

Which animals are known to use ultrasound for navigation?

• Lions

• Elephants

• Bats

• Cats

Why is ultrasound preferred over X-rays in some medical examinations?

• It does not harm tissues or cells.

• It is faster.

• It is cheaper.

• It is more colorful.

How are cracks in machinery detected using ultrasound?

• By measuring temperature changes

• By observing color changes

• By listening for echoes

• By detecting reflected ultrasound waves