INVESTIGATION 3, PART 2

Sounds through Solids

Materials Student sheet no. 16 Student sheet no. 17 Scissors Small nail Wood dowels Tissue Tape Plastic cups Paper clips String 2m.

Telecup for the teacher Punch hole in bottom of 2 cups.

Thread string through plastic cups.

Tie end of string to paper clip.

Dowel for teacher Tape facial tissue to one end of a dowel.

Introduction Can sound travel through solid materials

like wood, steel, plastic, and glass?

To hear sound, it must travel from its vibrating source to our ears through a medium.

Today, you will test solid materials to see if sound can travel through solids.

Demonstration of Telecup Carefully hold the cups.

Do not touch the bottom of the cup or the string.

Pull string tight, but not so tight that it breaks or comes out of the hole.

Student Sheets Read directions

Do investigation.

Record observations.

Do “Go Further.”

Discussion Can you hear sound through the string?

Can you hear sound through the wood?

How does the sound get to your ear?

Is sound hear through solids different from sound heard through air?

Review Can sound travel through solids?

How does the sound get from the water, through the stethoscope, and to your ear? The sound vibrations travel through the water, to

the solid stethoscope diaphragm, and through the air in the stethoscope tubes to the ear.

What must sound have to be heard? Sound must have a source, a receiver, and a

solid, liquid, or gas medium to travel through.

Imagine you have 2 rocks in your hands. You hit them together in the air. Then, you put one rock on your desk, put your

ear to the desk, and hit the rock with the other rock.

Finally, you jump into a pool, go to the bottom with the 2 rocks, and hit them together.

How do you think the sounds of the rocks would compare? The sounds would seem loud traveling through the

desk and the water and seem softer traveling through the air.

The End!!!