Activity-4.docx

Activity 4 Sound check… Adapted from: Littell, McDougal Science. Integrated Course 1, Teacher’s edition. McDougal Littell, a division of Houghton Mifflin Company C79.

I. Objectives: • Produce radio waves. • Detect radio waves. II. Materials: • Two - 25 cm copper wire • C or D battery • electrical tape • metal fork • portable radio

Procedure: 1. Tape one end of the first wire to one end of the battery. Tape one end of the second wire to the Other end of the battery. 2. Wrap the loose end of one of the wires tightly around the handle of the fork. 3. Turn on the radio to the AM band and move the selector past all stations until you reach static. 4. Hold the fork close to the radio. Stroke the free end of wire across the fork’s prongs. 5. At a distance of 15 cm from the radio stroke again the free end of the wire across the forks’ prongs. 6. Repeat step 5 at a distance 20 cm from the radio.

III. Guide Questions: Q5. What happens when you stroke the prongs with the wire?

Q6. How does changing the position affect the results?

Q7. What might be the cause when you sometimes hear static sound in your radio? What can be done to resolve it?

IV.

Conclusion