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ultralow frequency

C2
UK/ˌʌl.trə.ləʊ ˈfriː.kwən.si/US/ˌʌl.trə.loʊ ˈfriː.kwən.si/

Technical/Scientific

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Definition

Meaning

A radio frequency band between 300 Hz and 3 kHz, used for specialized communication.

Any extremely low frequency range, often referring to signals or phenomena occurring at rates far below typical human perception or standard measurement ranges.

Linguistics

Semantic Notes

Primarily a technical term in physics, engineering, and geophysics. The hyphenated form 'ultra-low frequency' is also common. It denotes the lower end of the electromagnetic spectrum.

Dialectal Variation

British vs American Usage

Differences

No significant difference in meaning. British English may slightly prefer the hyphenated form 'ultra-low frequency'.

Connotations

Identical technical connotations in both varieties.

Frequency

Extremely rare in general discourse; used almost exclusively in technical contexts in both regions.

Vocabulary

Collocations

strong
ultralow frequency signalsultralow frequency bandultralow frequency waves
medium
ultralow frequency communicationultralow frequency rangeultralow frequency noise
weak
ultralow frequency deviceultralow frequency measurementultralow frequency field

Grammar

Valency Patterns

Noun + of + ultralow frequencyAdjective + ultralow frequency + noun

Vocabulary

Synonyms

Strong

subsonic frequency (in specific contexts)

Neutral

ULFvery low frequency (context-dependent)

Weak

extremely low frequencyinfrasonic frequency

Vocabulary

Antonyms

ultrahigh frequencyhigh frequencyvery high frequency

Phrases

Idioms & Phrases

  • “None”

Usage

Context Usage

Business

Virtually never used.

Academic

Used in physics, engineering, and earth sciences papers discussing electromagnetic phenomena or specialized communication.

Everyday

Extremely rare; would only appear in popular science articles.

Technical

Core usage context; refers to a specific band in the radio spectrum for submarine communication, geophysical research, and military applications.

Examples

By Part of Speech

adjective

British English

  • The submarine uses an ultralow frequency transmission system.

American English

  • Researchers detected an ultralow frequency signal from the experiment.

Examples

By CEFR Level

B2
  • Some animals might sense ultralow frequencies before earthquakes.
C1
  • The study focused on ultralow frequency electromagnetic waves and their propagation through the ionosphere.

Learning

Memory Aids

Mnemonic

Think 'ULTRA' meaning 'extremely' + 'LOW' + 'FREQUENCY' – it's the extremely low end of the radio dial.

Conceptual Metaphor

DEPTH/SUBMERGENCE (e.g., signals that penetrate deep into earth/water).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • Avoid translating 'ultra-' as 'ультра-' without context, as it can imply extremism. The technical term 'сверхнизкая частота' is accurate.

Common Mistakes

  • Confusing it with 'ultrahigh frequency' (UHF).
  • Using it as a general adjective for 'very rare' instead of its technical meaning.
  • Misspelling as 'ultra low frequency' (open compound).

Practice

Quiz

Fill in the gap
Specialised military communication sometimes uses the band to contact submerged submarines.
Multiple Choice

In which field is the term 'ultralow frequency' most commonly used?

FAQ

Frequently Asked Questions

Not exactly. Infrasound refers to sound waves below human hearing (below 20 Hz). Ultralow frequency (ULF) refers to electromagnetic radio waves between 300 Hz and 3 kHz.

No, that would be a mistake. The term is technical and describes a specific range of electromagnetic waves, not the common occurrence of an event. Use 'very low frequency' or 'extremely rare' instead for events.

Their ability to penetrate seawater and ground makes them valuable for communicating with submarines and in geophysical surveying.

Both 'ultralow frequency' and 'ultra-low frequency' are accepted. Style guides may differ, but the meaning is identical.