# Frequency vs Ultrasound - What's the difference?

frequency | ultrasound |

## As nouns the difference between frequency and ultrasound

is that frequency is (uncountable) the rate of occurrence of anything; the relationship between incidence and time period while ultrasound is (physics) sound with a frequency greater than the upper limit of human hearing; approximately 20 kilohertz.

# frequency

## English

### Noun

(frequencies)
• (uncountable) The rate of occurrence of anything; the relationship between incidence and time period.
• * With growing confidence, the Viking’s raids increased in frequency .
• * The frequency of bus service has been improved from 15 to 12 minutes.
• (uncountable) The property of occurring often rather than infrequently.
• * The FAQ addresses questions that come up with some frequency .
• * The frequency of the visits was what annoyed him.
• (countable) The quotient of the number of times $n$ a periodic phenomenon occurs over the time $t$ in which it occurs: $f = n / t$.
• * The frequency of the musical note A above middle C is 440 oscillations per second.
• * ''The frequency of a wave is its velocity $v$ divided by its wavelength $\lambda$: $f = v / \lambda$.
• * Broadcasting live at a frequency of 98.3 megahertz, we’re your rock alternative!
• * The frequency for electric power in the Americas is generally 60 Hz rather than 50.
• (statistics) number of times an event occurred in an experiment (absolute frequency)
• #### Synonyms

* (rate of occurrence) oftenness

#### Antonyms

* (rate of occurrence) period

* cadence * commonness * occurrence * periodicity

# ultrasound

## English

### Noun

(wikipedia ultrasound)
• (physics) sound with a frequency greater than the upper limit of human hearing; approximately 20 kilohertz
• (medicine) The use of ultrasonic waves for diagnostic or therapeutic purposes
• #### Antonyms

* (physics) infrasound

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