Mention at least five areas of study not related to physics

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?