Sound volume experiment

ステップ 1:準備

説明

Use your BBC micro:bit to find out how distance affects the volume of a sound.

このプロジェクトは、理科教師向けに White Rose Science と提携して開発され、生徒が音の伝わり方について学習できるようにします。 生徒は、コンピュータ プログラムでのシーケンス、ループ、変数、選択の使用についても学習できます。

このビデオでは実験のやり方を説明します。

動作の仕組み

• You play a continuous sound at a fixed volume from a fixed location.
• You measure the sound levels in decibels at two-meter intervals from the sound source, using your micro:bit and a battery pack.
• You should be able to work out from the measurements that sounds get fainter as they get further from the sound source.

必要なもの

• a continuous sound source at a fixed volume; you might like to play our tone.mp3 file from your computer (do not use a sound source which could vary in volume, such as a drum)
• micro:bit
• バッテリーパック
• a tape measure or meter ruler
• a large quiet space to conduct the experiment in, such as a school hall

ステップ 2: 研究

1. Download the hex file and put the code onto your micro:bit. You do not need to write the code for this project yourself to do the experiment. If you are interested in coding it, visit the Step 3: Code it section below.
2. Play your continuous sound.
3. Put the micro:bit next to your sound source. Press button A to take a reading and button B for the reading to appear on the micro:bit’s LED display.
4. When the micro:bit’s LED display is not showing a reading, it shows a graph indicating current sound levels. You can use this graph to help you decide when to take a reading. Make sure that there are no other sounds that would make your readings less accurate.
5. Using your tape measure or ruler, measure a two-meter distance from the sound source and take another reading.
6. Continue taking readings at two-meter intervals up to eight meters. (The micro:bit’s recordings may be less accurate after this distance).

Tips

• Conduct the experiment in a large space with no obstacles, so that you can easily measure distances from the sound source in a straight line.
• Conduct the experiment in a quiet space.
• For more accurate results, take a few readings at each distance interval and work out their average.

Step 3: Code it

Watch this video to find out how to code the project:

If you are interested in modifying the code for this project, click on one of the buttons below: