Frequencies greater than _____ are ultrasonic.

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Multiple Choice

Frequencies greater than _____ are ultrasonic.

Explanation:
Ultrasonic refers to sounds above the range of human hearing. Humans typically hear up to about 20,000 Hz, so anything above that is considered ultrasonic. The value that marks this boundary is 20,000 Hz. The other options—2,000 Hz and 10,000 Hz—are well within the audible range, while 50,000 Hz is also ultrasonic but not the standard cutoff. Thus, 20,000 Hz is the correct boundary value.

Ultrasonic refers to sounds above the range of human hearing. Humans typically hear up to about 20,000 Hz, so anything above that is considered ultrasonic. The value that marks this boundary is 20,000 Hz. The other options—2,000 Hz and 10,000 Hz—are well within the audible range, while 50,000 Hz is also ultrasonic but not the standard cutoff. Thus, 20,000 Hz is the correct boundary value.

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