Which of the following frequencies is considered ultrasonic?

Which of the following frequencies is considered ultrasonic?

Step 1: Understand what frequency means. Frequency is how many times something happens in a certain time period, usually measured in hertz (Hz).
Step 2: Know the difference between sound frequencies. Sounds we can hear are usually between 20 Hz and 20 kHz (20,000 Hz).
Step 3: Learn what ultrasonic means. Ultrasonic refers to sounds that are above the range of human hearing, specifically above 20 kHz.
Step 4: Identify the frequencies given in the question. Check if any of them are above 20 kHz.
Step 5: If a frequency is above 20 kHz, it is considered ultrasonic.

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