Предмет: География, автор: Аноним

по Естествезнание 3класс вопрос Ультразвук-это ________? ​

Ответы

Автор ответа: sofiashipanska
4

Ответ:

Ультразву́к — звуковые волны, имеющие частоту выше воспринимаемых человеческим ухом, обычно, под ультразвуком понимают частоты выше 20 000 герц.

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вот текст
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