Sound Frequencies and Human Hearing

The video tutorial explains the range of sounds humans can hear, from 20 Hz to 20 kHz, and how this range can vary among individuals and decrease with age. It introduces infrasound, which is below the human hearing threshold, and ultrasound, which is above it. Infrasound can cause physical vibrations, while ultrasound is used in medical imaging and sonar. The tutorial highlights the applications and effects of these sound frequencies.

What is the frequency range of sounds that the human ear can typically hear?

• 10 Hz to 10 kHz

• 40 Hz to 40 kHz

• 20 Hz to 20 kHz

• 30 Hz to 30 kHz

Which musical notes are mentioned as examples of sounds we can hear?

• G, A, B

• C, A, D

• A, B, C

• E, F, G

What is the upper limit of the hearing range for some people?

• 10 kHz

• 15 kHz

• 20 kHz

• 25 kHz

How does the hearing range change as people age?

• It decreases

• It increases

• It fluctuates

• It remains the same

What is the term for sound with a frequency lower than 20 Hz?

• Infrasound

• Supersound

• Ultrasound

• Subsound

What physical effects can infrasound have on the human body?

• It can enhance vision

• It can improve hearing

• It can increase heart rate

• It can cause organs to vibrate

What is the term for sound with a frequency higher than 20 kHz?

• Hypersound

• Ultrasound

• Infrasound

• Supersound

Which of the following is NOT an application of ultrasound?

• Radio broadcasting

• Medical imaging

• Sonar

• Dog whistles

Why are dog whistles effective?

• Dogs can hear higher frequencies than humans

• Dogs can hear lower frequencies than humans

• Dogs have better hearing overall

• Dogs are trained to respond to whistles

What is one use of ultrasound in navigation?

• Compass

• Radar

• Sonar

• GPS