A new silencing device for domestic appliances operates by producing sound waves that cancel out the sound waves prod...

jingjingxiao11111@gmail.com on August 28, 2022

Why not e?

Thanks

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Emil-Kunkin on August 29, 2022

Hi Jing Jing,

The thing that we need to explain is the fact that vacuums with this new device will need to consume less energy. E tells us that all silencers in vacuums make them heavier than they would otherwise be. I don't think there is any connection between the weight/mobility of a vacuum and its power needs.

jingjingxiao11111@gmail.com on September 3, 2022

Thanks