Ears and Hearing (04)

Overview

Pop Quiz: Ears and Hearing

Question 1

We measure sound in units called "decibels." How many decibels is the sound of a jet engine at takeoff?

Choices

10, 199, 150, 62

Conclusion

The roar of a jet engine measures about 150 decibels from a distance of 25 meters. That's loud enough to cause permanent hearing damage.

Question 2

Now let's try another. True or false: Sound waves travel faster through air than seawater.

Conclusion

False! Sound travels about 1,500 meters per second in seawater. That's about four times faster than sound travels through air!

Question 3

And finally, bats use sound waves to locate objects. What's the name of this technique?

Choices

Echolocation, sonar, radar, sonogram

Conclusion

Bats (along with dolphins and whales) use echolocation to navigate, hunt, and avoid obstacles. Neat!

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.