Examlex
Of the following kinds of waves, the ones that cannot travel through a vacuum are
Documentaries
Documentaries are a genre of film and television that provide a factual record or report on various subjects, aiming to inform or educate viewers.
Nonconcealed observation
A method of observation in which the subjects are aware that they are being observed, potentially influencing their behavior.
Archival studies
Research methods that involve the examination and analysis of historical records and documents to understand past behaviors or trends.
Systematic observation
An observational research method where data is collected in a structured, organized, and methodical manner.
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