Khan Academy Static

Can you listen to a beam of light? Audio signals can be transmitted along radio waves through space, and in electrical pulses through wires. Visible light and other forms of electromagnetic radiation can carry audio signals, too. In this activity, learn how to build a simple device in which the signal from a radio is transmitted along a beam of light traveling between a light-emitting diode (LED) and a solar cell. This science snack was developed by Exploratorium Teacher Institute staff Don Rathjen and demonstrated by Exploratorium Senior Scientist Paul Doherty.

17285_Build_the_transmitter.html

17284_Build_and_test_the_receiver.html

17286_Construct_the_parallel_circuit_put_it_all_together.html

17283_Light_into_sound_introduction.html