Doppler effect

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The Doppler effect illustration showing how a wave changes from a static source and gets either bunched up or spread out if you're standing in front of or behind a moving source like a siren

The Doppler effect is the change in frequency of a wave as its source moves relative to the observer. The same effect that causes the change in pitch of a siren as it drives past is also used to estimate blood flow with ultrasound, measure the speed of a passing car, and even determine the motion of the stars. Doppler shift-based satellite navigation was also the first operational use of a system that eventually led to GPS.

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an electric field is shown with the word key equation on top of it

The document discusses the Doppler effect, which describes how the observed frequency of a wave (such as sound) is different when the source of the wave and the observer are in relative motion. Specifically: - It is named after Christian Doppler, who first described the phenomenon in the 19th century. - The frequency observed is higher if the source and observer are moving towards each other, and lower if they are moving away from each other. - An equation is provided to calculate the…

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the formula for f = 1 and c = 2 sticker

Decorate and personalize laptops, water bottles, and more Removable, kiss-cut vinyl stickers Super durable and water-resistant 1/8 inch (3.2mm) white border around each design Matte finish For orders with 2+ small stickers, they will be printed in pairs with two stickers on one sheet to reduce sheet waste Since every item is made just for you by your local third-party fulfiller, there may be slight variances in the product received

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