AIM: What is an Echo?
Define the term “echo”.
Identify animals that naturally
use echolocation
Describe echolocation
AIM: What is an Echo?
Echo, sonar, echolocation,
sonogram
What happens when a wave hits a
barrier?
It is either absorbed, or it bounces back.
What is it called when it bounces back?
A reflection
An echo, is a reflection of a sound wave
DEFINITON:
An echo, is a reflection of a sound
wave
What is echolocation?
Certain animals, like bats, use
echolocation to find their way
around, as well as for finding
food.
How does a bat figure out
where he is going?
Certain animal give off high pitched
sound. These sounds are reflected
off of objects. These animals are
able to locate themselves and their
prey because they have developed a
sophisticated internal process for
deciphering the returning sound
(wave) echoes.
As major predators of insects, bats
are beneficial and essential to the
balance of nature.
A common brown bat can devour
600 mosquitoes in one hour!
Answer True or False to the
following Questions
HOW MUCH DO YOU KNOW?
How often have you heard
someone say, "I'm as blind as
a bat!"
Bats are the subject of many
popular misconceptions.
No matter how much bats are
liked (or disliked), they are
under-appreciated.
How much do you know about bats?
1. Are bats blind.
2. Are bats rodents.
3. Bats are the only flying mammal.
4. Is the bas a threatened species?.
5. Are bat droppings used to make some
antibiotics.
6. Bats cause a high percentage of rabies
cases.
Answers:
1. False; many bats have good vision; they are
active at night and have developed a keen
sense of sound
2. False; bats belong to the order Chiroptera;
3. True bats are the only flying mammal
4. True; over 50% of American bat species are
in severe decline or endangered.
5. True, bat droppings are used in medicines
6. False; most of the fatal cases of rabies in the
U.S. are caused by rabid dogs;
What other animal use echolocation?
Bats, dolphins, certain whales, some
birds.
Dolphins us Echolocation by
the emission of sound from
their head region. The
received echoes pass through
special sound conducting
tissue in the lower jawbone to
the inner ear.
How sensitive is echolocation?
Echolocation is extremely
sensitive.
•For example, dolphins in
aquariums can distinguish
between objects that are the
size of a kernel of corn at
about 50 feet (15.2 meters)
away.
Do people use echolocation?
We use a form of echolocation
Called SONAR:
SONAR is used to map the ocean
floor,
SONAR helps locate underwater
objects,
Why does the navy use Echoes?
It is called SONAR
How is the echo use in this picture?
With SONAR, we have mapped the ocean floor!
With Sonar
The ship has a transmitter which send out
sound waves
The sound waves reflect off of an
underwater object, producing an echo
The sound waves bounce back from the
reflection.
The ship also has a receiver which picks up
and then interprets the echo to pinpoint
exact locations.
Outgoing Sound
Reflected Sound
What is this Navy Ship
trying to do ?
Ultrasound = sound higher
then we can hear
•like a dog whistle
•like the sonar used by
animals and submarines
•echolocation
Infrasound = sound lower
then what we can hear
•Elephant stomp
By Doctors:
•Expectant mothers get ultrasound tests
to examine their unborn babies for
health problems
•A viewable picture is actually developed.
•Why do you think the ultrasound is
preferred over the older x-ray technology
on expectant mother?
By People:
•Used a lot in teeth cleaning
AIM: What is an echo?
Class Activity:
W/S Concepts 8-4
AIM: What is an echo?
Homework:
INTERNET QUESTIONS