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Visitors: 3180458 
Time of Visit : 5Minute
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Audio Guide

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Audio Guide
Audio Guide:
In 1842, Austrian physicist Christian Doppler found that the relative speed between the sound source and the observer will cause the wavelength and frequency of the sound received to change. French physicist Armand Hippolyte applied this principle to the measurement of celestial objects in 1848. When a celestial object moves closer to the Earth, the spectral lines observed will move towards the blue end. Conversely, when an astronomical object moves away from the Earth, the spectral lines shift to the red end. The phenomena of “blueshift” and “redshift” are a result of the Doppler Effect.

Exhibit Introduction:
Models and mechanical devices are used to display the effects of sounds nearby and afar, letting the visitors know about the principle and characteristics of Doppler Effect.