A
B
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D
E
100
Doctors use ultrasound, because if it is between 1 and 10 million Hz, it can safely pass through a person's:
body
100
Do short or long wavelengths of ultrasonic waves provide more information about objects?
short
100
Visually __ people can use sonar to navigate.
impared
100
Ultrasound is used to make images of __ such as the heart and bladder or organs. What is this an ultrasound of?
a baby (4-6 weeks)
100
Waves that have 20,000 Hz or more are considered:
ultrasound
200
What is 'reflected sound'?
an echo
200
A person who designs, builds, or maintains engines, machines, or public works is an:
engineer
200
What American inventor was the first to record, store and play back sound?
Thomas Edison
200
Using science to improve our lives is:
technology
200
What does a Hz measure
frequency
300
The ocean floor can be mapped with:
sonar
300
Sonar can help ships avoid __ in the ocean.
wrecks
300
What is a system that uses sound waves to determine the location of objects or to communicate?
sonar
300
Sonar can be used to __ the ocean floor.
map
300
You might buy sonar at Walmart to help you:
fish
400
What is this an ultrasound image of?
brain (brain tumor for a double click)
400
Using ultrasound to improve our lives is an example of:
technology
400
What does a Hertz (Hz) measure?
the number of waves that pass by a point in one second
400
!! DAILY DOUBLE!!
A Hertz measures how many __ pass by a point in one ___.
waves; second
400
The amplitude of a wave is measured in:
decibals
500
Waht are waves that have 20,000 Hz or more are considered?
ultrasound
500
What uses reflected sound waves to find things?
echolocation
500
How high of an ultasound can pass safely through a person's body?
between 1 million and 10 million
500
What is sonar?
a system that uses sound waves to determine the location of objects or to communicate
500
What do decibels measure?
amplitude of a wave is measured in: