Noise in tennis: Why are they moaning like that?
2019-05-08T03:14:57.610Z
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![](https://cdn1.spiegel.de/images/image-1424893-860_poster_16x9-odyc-1424893.jpg)
They are noisy up to 100 decibels and annoy fans like opponents: groans in tennis. For years it has been discussed what influence the sounds have. The University of Jena has now carried out an experiment.
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Source: spiegel