Doppler Effect Demonstration Apparatus with 92dB Buzzer Electricity & Magnetism_Electrochemistry Universal 2-input NAND gate module

Universal 2-input NAND gate module with red/green LED outputs and a printed truth table

and 3 rods for multi-configuration study

Pair of nylon-fringed metal pompons on insulated stands that fan into wide cones under mutual repulsion when charged

sized for student work spanning single-cell and small-battery-stack voltages

Doppler Effect Demonstration Apparatus with 92dB Buzzer Electricity & Magnetism_Electrochemistry Universal 2-input NAND gate moduleDemonstrates the Doppler effect by swinging a 92dB buzzer on a 0. 8m tether, revealing the shift between approaching and receding frequencies in introductory wave and sound units.