Doppler effect coffee mug

Marsoni

M251S

$14.18

Get it in 3 business days with 1 day shipping. Friday, May 29

Doppler effect coffee mugCoffee mug design visualizing the Doppler effect Doppler effect or doppler shift is when a source of wave is moving away or towards an observer. As a result the wave frequency is increased or decreased and the amount of change depends on the speed of the moving object. This is the reason that the siren of an emergency vehicle passing us sounds higher as it approaches us and after it passes us it's higher. Another very common instance of it is the so

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These balls were almost exactly what I needed. I was replacing my boy’s favorite ball, which is the 3” squeaky, spikey ball that fits in the chuck it launcher. Unfortunately I saw the shiny object next to it and because there were SIX balls and a dollar less, I failed to see that these are 3.5” balls instead of 3”…. Great balls but no fitty in the slingy. Buyer beware. No chuck it no problem. Save a buck.

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Reviewed in the United States on March 9, 2026

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HollisHoHo

Lexington, US

★★★★★ 5

MY CHIHUAHUA LOVES THESE BALLS!!

Color: Samll Set of 8

My little chihuahua, BamBam, is addicted to balls, especially little balls that squeak! However, any balls that have material on them, BamBam will tear them apart, swallow the material and then get an upset tummy! These balls saved the day! BamBam LOVES them & she cannot tear them apart! They hold up so well! No matter how much BamBam plays with them, they keep squeaking away!

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Reviewed in the United States on July 15, 2025

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Laurens springerslng

Houston, US

★★★★★ 5

Great thick squeaky ball

Color: Large Set of 2

These are good thick rubbery squeaky balls. My boy loves them! He's 75lbs. Strong chewer. I hav hard time squeezing to squeak, but he doesn't... He loves it!!!

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Reviewed in the United States on March 24, 2026

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g a ross

Natrona Heights, US

★★★★★ 5

Squeaky ball

Color: Large Set of 4

Perfect squeaky ball. Dogs love them. I love that they're durable and their thickness aids their durability. My Great Dane will play alone for hours with a ball.

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Reviewed in the United States on June 20, 2025