Doppler Effect Mug
A more unusual gift, of interest to music or science teachers.
An increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers.
The Dye Sublimation Process we use to print them gives a high-quality, glossy, smooth finish so the print will not crack, fade or peel. Microwave and Dishwasher safe.
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