Question

Describe 2 experiments to show that sound has vibarations associated with it?

Answer 1

Answer:

Explanation:

Activity 1

We may not be able to see sound waves move through the air, but we can demonstrate how sound made by a tuning fork creates a pattern of waves in water.

Materials

Tuning fork

Large bowl of water

Rubber mallet or other soft surface

Paper towels

What To Do

• Have students activate the tuning fork by striking it with a rubber mallet or on a block of wood, the heel of their hand, or the bottom of a shoe. Ask them to describe the sound it makes. Is the volume loud or soft? Does it make a high-pitch or low-pitch sound?

• Show them how to use their hands to stop the vibrations of the tuning fork.

• Next, place the bowl of water on a paper towel.

• Have students activate the tuning fork again, and place it on the surface of the water (not submerged into it).

The result: waves will form as the vibrations are transmitted through the water!

Activity 2

This activity explores how sound energy (vibrations) are transferred from the tuning fork to the ping-pong ball to make it move.

Materials

Tuning fork kit (includes tuning fork, ping-pong ball and string)

Tape

Ruler

 

What To Do

Cut a string about 1-1 ½ feet long and tape one end of it to the ping-pong ball.

Have one student hold the string away from her body. Without striking the tuning fork, move it toward the ping-pong ball. Ask students to discuss what happened.

This time have students strike the tuning fork and move it slowly toward the ping-pong ball.

Discuss: what happens to the ball as the tuning fork gets closer?