Author Question: Which of the following statements best describes electromagnetic radiation? A) Light waves are ... (Read 197 times)

nenivikky · **on:** Aug 27, 2018

Which of the following statements best describes electromagnetic radiation?

A) Light waves are oscillations of electric and magnetic fields.
B) All light energy is visible.
C) Light energy is due to vibrations in the air.
D) Light waves propagate through a medium called ether, similar to waves in water.
E) Light is due to oscillations in the nucleus of atoms.

Question 2

Unlike fresh water, ocean water contracts as it is cooled all the way down to its freezing point, which is about -18C. Why?

A) As the water cools, it becomes more dense and then it sinks. The pressure from the weight of the ocean exerted on the ice below the surface of water causes it to be more dense.
B) macrocrystals instead of microcrystals are formed during the freezing of ocean water.
C) As the water cools, the salt ions in the ocean water pull the molecules closer together.
D) The presence of a solute disrupts the rate of ice microcrystal formation.