Doppler effect

Understand the principle and application of the Doppler effect through the uniform motion of the sound source device. The exhibit features a buzzer fixed at the end of a rotating rod and moving in a uniform circular motion through a sound source device. The observer stands on one side and listens to the sound of the buzzer. Due to the relative motion of the buzzer with respect to the observer, the Doppler effect causes the observer to hear the buzzing sound fluctuating. After the visitor presses two start buttons, the control box will move at a constant speed and make a sound. As the control box rotates, the sound heard by the visitor changes. When the control box moves away, the tone will gradually decrease. As the control box gradually approaches, the tone will increase again. In fact, during this process, the sound emitted by the control box itself remains consistent, and the reason for the difference in pitch is the Doppler effect. Target audience: Adolescents aged 6-15 years old. Display format: Electromechanical interactive device operation instructions (audience body).

Interaction type: Interactive multimedia installation. The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

The Doppler effect is named in honor of Austrian physicist and mathematician Christian John Doppler, who first proposed this theory in 1842. The main content is that the wavelength of object radiation changes due to the relative motion between the wave source and the observer. In front of the moving wave source, the wave is compressed, the wavelength becomes shorter, and the frequency becomes higher; When behind a moving wave source, the opposite effect will occur. The wavelength becomes longer and the frequency becomes lower; The higher the speed of the wave source, the greater the effect it produces. Based on the degree of wave red (or blue) shift, the speed of the wave source moving in the observation direction can be calculated. Reference materials.