4. Let B = the magnitude of the magnetic field of an EM wave; f= the frequency of the wave; and
c = the speed of light. What is the magnitude of the electric field E?
(1 point)

A. B/f

B. fB

C. B/c

D. cB

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.