An object that acts as a blackbody emits photons because ____
a. thermal energy excites electrons to the ground state
b. electrons in the atoms of the object jump to lower energy levels
c. electrons in the atoms of the object jump to higher energy levels
d. atoms in the object collide, changing the motion of charged particles
e. atoms in the object have absorbed photons from an external source
d
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Which of the following is not a common use of microwaves?
a. cooking b. medical imaging c. radar d. communications
Jill is farsighted and cannot see objects clearly that are closer to the eye than 80.0 cm. What is the refractive power of the contact lenses that will enable her to see objects at a distance of 25.0 cm from her eyes?
A) +2.75 diopters B) -2.75 diopters C) -4.72 diopters D) +4.72 diopters E) +7.00 diopters
A large ice cube containing an iron railroad spike floats in a brim-full container of water. When the ice cube melts,
A) water spills over. B) no change in water level occurs. C) water level in the container drops.
Pluto is an example of a plutino
a. True b. False Indicate whether the statement is true or false