Mon Prof Augmenté
Bat Echoes at Night
Age 13 · Animals
A bat flies through a moonlit woodland and sends out calls. The returning echoes come back at different times and with different shapes.
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Age 13: open this week
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In the picture
- The bat’s mouth: the outgoing call
- The tight arc from the moth: a quick echo from a small nearby object
- The narrow arc from the branch: a later echo from a farther object
- The wide arc from the tree trunk: a strong echo from a large object
Examples
- A shout in a canyon returns as an echo after a short delay.
- A parking sensor uses sound pulses to tell how close an obstacle is.
Key takeaways
- A longer echo delay means the object is farther away.
- Echo shape helps show an object’s size and form.
Quiz: Bat Echoes at Night (Age 13)
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What does a longer delay before an echo returns tell a bat?
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What can the shape of an echo help a bat judge about an object?
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What kind of object did the wide echo shape come from?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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