Long-range acoustic device

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/long-range-acoustic-device

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the device classification?Specialized loudspeaker system for directed acoustic transmission
2. What is the acoustic projection principle?Utilizes focused beam technology to direct sound energy
3. How does a LRAD send sound over long distances?It uses many transducers arranged in a pattern that makes the sound travel straight ahead, like a flashlight but for sound.
4. Why do navies and coast guards use LRADs?They help warn boats and stop pirates by shouting loud, clear messages that can be heard far away.

Transducer: A device that converts one form of energy into another, in this case, electrical energy into sound energy.
Omnidirectional: Radiating or transmitting in all directions equally.
Sound Pressure Level (SPL): A logarithmic measure of the effective pressure of a sound wave relative to a reference pressure, commonly expressed in decibels.