Which material is best for muffling sound Miss

Which material is best for muffling sound? Miss M Gheewala

Professor Big-Hair and Professor Bee-Hive have a problem. They can’t do any work, because their alarm clock is constantly ringing and the off switch is broken. Professor Big-hair thinks if they wrap it in a sheet, they can muffle the sound so they won’t be able to hear it. Professor Beehive thinks they should do an experiment with different materials, to see which one will muffle the sound best. She says they should wrap the alarm clock in each of the materials, and see if they can still hear it ringing.

Which material do you think will be good at muffling the sound? Fill in the gaps in these sentences about the experiment. Choose the right words from the boxes at the bottom. The professors should wrap the ________ in each ______ they are testing. They should make sure they use ________ number of layers of each material, and they leave _______ gaps when they wrap up the alarm clock.

When you do an experiment, it’s important to make sure that it’s a fair test. Doing a ‘fair test’ means doing an experiment where you change only ________. To test which material muffles sound best, you must only change the ________ each time – you have to make sure you use the _______ number of layers for each wrapping, that you’ve used the same _____________ to muffle each time, and you measure how _______ it is in the same way each time. If you changed the material and changed the number of layers as well, you _____ know if the result was because of the material or the number of layer. Would Sound Same two things weather material different your socks One thing loud always Wouldn’t hear

Which materials are we going to use? Materials we are going to use in this investigation are: • Newspaper • Bubble wrap • Fabric • Cardboard boxes • Coats Which material do you predict to be the best at muffling sound?

Method What are you going to do? How are you going to do it? What will you need to keep the same or change?

Results In your groups use the following table to investigate if your material is the best at muffling sound. Material Layers How good it was at muffling sound

Class results Material Newspaper Bubble wrap Fabric Cardboard boxes Coats Layers used How good it was at muffling sound

Conclusion Which material was best at muffling sound? Remember the quieter it made the sound, the better it was at muffling sound. How can you compare the different materials?

Can you write a letter to Professor Big-Hair and Professor Beehive to explain your findings from your investigation. Explain in your letter what you did and how you reached the final solution. Ensure you give the Professors advice on fair testing and why this is important.