Which one statement below is true? select one: o a. when an em wave enters a new medium, its wavelength stays the same and its frequency changes. o b. light travels more slowly in glass than in air. o c. the electric and magnetic fields oscillate at different frequencies in an em wave o d. dispersion only occurs for the visible range of the em spectrum.

An object's buoyant force and weight mean the same thing.a. trueb. false

What would be the result of an alpha particle coming into a magnetic field? a) the alpha particle will stop moving. b) the alpha particle will reverse its direction. c) the alpha particle will be deflected in a curve path. d) the alpha particle will continue to travel in a straight line.

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=