What is an echo?
Arms cache found near Afghan border

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1st - 2nd Grade
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A sound that is absorbed by surfaces
A sound that is created by a musical instrument
A sound that is reflected back to the listener
A sound that is amplified by a microphone
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which condition is necessary for an echo to occur?
The surface must be hard and reflective
The surface must be soft and absorbent
The sound must be high-pitched
The sound must be loud and continuous
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the distance between the source and the reflecting surface affect an echo?
It has no effect on the echo
A shorter distance results in a clearer echo
A greater distance results in a louder echo
A greater distance results in a delayed echo
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In which field is the use of echoes particularly significant?
Painting
Gardening
Medicine
Cooking
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is one application of echoes in technology?
Echoes are used in digital photography
Echoes are used in sonar systems
Echoes help in noise cancellation
Echoes are used in solar panels
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