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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My dog is a massive squeaky toy fan. She's also pretty aggressive with her squeaky toys and they usually don't last more than a month. This one is perfect for her - durable, noisy and bouncy. She loves it. The package comes with six but I only have her one and it's lasted nearly a month which is a record because none of her other silicone squeaky toys have lasted this long. It's perfect for her small mouth too. If you live in a flat with thin walls you might want to enforce a curfew with this toy or reserve it for outdoors because it is LOUD. Wear ear protection if you get migraines like me LMAO

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Reviewed in the United States on February 10, 2026

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Gregory K

Los Angeles, US

★★★★★ 5

Great squeaky toy!

Best squeaky toy for our 18 pound 'puppy.' Great for indoor or outdoor use and he hasn't punctured them yet!

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Reviewed in the United States on April 26, 2026

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Azetan

Bozeman, US

★★★★★ 5

Good quality, lotsa fun

Not easy to find a sturdy toy for a minipoodle that loves to play rough with his toy. He has not been able to break this into pieces and that feels reassuring that I don't have to worry about little pieces and choking. These things bounce funny and my boy loves playing with it

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Reviewed in the United States on January 4, 2026

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Edward harris

Belleville, US

★★★★★ 5

dottie

good toy foy her she love them she was happy

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Reviewed in the United States on May 20, 2026

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Grandmother

Chelsea, US

★★★★★ 5

Necessary for a small dog.

These are great for a small dog! They can get their mouth around it unlike a round ball. My dog is obsessed with these. They are great for making him love a new guest to the house. All they have to do is squeak and throw the toy and they have a new friend!

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Reviewed in the United States on April 6, 2026