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.
Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int
moon light
Absorption spectra and light energy
Summary view of the light reactions as they occur in the thylakoid
Diagrams of Brain Waves per Seconds
Light Green Eye Color