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Which material will muffle sound best?

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Sound level meter (decibel meter)

Electric stopwatch

Bubble wrap

Cloth

Newspaper

Shoe box with lid

Sound level meter

Notebook and pencil for recording results

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1. Set up the sound level meter near a speaker producing a constant sound.

2. Cover the speaker with different materials (bubble wrap, cloth, newspaper).

3. Use the sound level meter to record the sound levels (in decibels) for each material.

4. Repeat for three trials for each material.

5. Record your results after each trial.

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(Prediction: This is a guess about what you think will happen before you experiment.)

Group 1: Cloth muffles sound best and newspaper muffles sound worst

Group 2: Cloth muffle sounds best.

Newspaper muffle sounds worst.

Group 3: Bubble wrap muffles sound best and towel muffles sound worst.

Group 4: bubble wrap will muffle the sound the best. And the cloth will muffle the sound the worst

Group 5: the towel Will muffle the sound best and the newspaper Will not muffle the sound

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Click the form and record the results of the activity.

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Grade 3A- Muffle Sound Activity Template.docx

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Questions:

1. Which material muffled sound the best?
Cloth and bubble rap

2. Which material muffled sound the worst?

newspaper

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1. Do you think this investigation is a fair test? Explain.

Yes,because the distance is the same

2. Could you identify the noise pollution in your community?

Complaints

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Conclusion:

Group 1: cloth muffled sound best and newspaper  muffle worst

Group 2: Cloth muffle sounds the best.

Bubble wrap muffle sounds the worst.

Group 3:

Group 4: newspaper is the best at muffling sound and bubble rap muffles the worst

Group 5:

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Identify the control variable:

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Identify the independent variable: the materials only

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Identify the dependent variable:

Material