Students will gain first hand experience of the Doppler Effect for sound used by NASA’s Deep Space Network. Materials For one Doppler ball (made in advance by the instructor): 6-inch to 8-inch diameter soft foam ball 1.5V about 400 Hz magnetic buzzer with wire leads C2032 single battery holder with wire leads C2032 battery Wire strippers Electrical tape Scissors for the teacher to cut into the foam ball Heavy-duty rubber bands String, about 1 meter long (Optional) Smartphone with sound frequenc