True or false: we are able to see an object when it emits or reflects one or more visible light frequencies.

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

If the area of a square has increased by a factor of 16, by how much has each side increased?

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?