Demonstrate the wave nature of sound at relatively short wavelength. Investigate reflection interference of sound waves etc. Transmit speech over microphone or set up a voice link with an FM radio. The equipment operates at a frequency of 40KHz giving a wavelength in air of approximately 8.3mm.

Comprising:

• Ultrasonic’s transmitter
• Ultrasonic receiver
• Ultrasonic slave transmitter
• Mini set with 2 Aluminium reflectors and perforated plate