What are sounds below 20000 Hz called?

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1. What are sounds above 20000 Hz called?
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Tags

1. #ordinarily
2. #smaller
3. #greater
4. #waves
5. #called
6. #between
7. #heard
8. #sound
9. #ultrasounds
10. #neither
11. #acoustic
12. #infrasounds
13. #those
14. #humans
15. #frequency