The needle in a compass . A. all of the above
B. keeps pointing in the same direction when you turn the compass points toward Earth’s magnetic north pole
C. is a magnet

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Could we see a galaxy that is 20 billion light-years away?

Which of the following types of electromagnetic radiation has the longest wavelength? a. infrared light b. visible light c. ultraviolet light d. microwaves