Which of the following best describes why we say that light is an electromagnetic wave?
A) The passage of a light wave can cause electrically charged particles to move up and down.
B) Light can be produced only by electric or magnetic appliances.
C) The term electromagnetic wave arose for historical reasons, but we now know that light has nothing to do with either electricity or magnetism.
D) Light is produced only when massive fields of electric and magnetic energy collide with one another.
A
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If a certain sample of an ideal gas has a temperature of 109°C and exerts a pressure of 1.2 x 104 Pa on the walls of its container,
how many gas molecules are present in each cubic centimeter of volume? The ideal gas constant is 8.314 J/mol • K and Avogadro's number is 6.022 × 1023 molecules/mol.
Tiny grains of zirconium silicate (zircons) found embedded in sedimentary rocks have been radiometrically dated to what age?
A) 4.57 billion years ago B) 3.85 billion years ago C) 4.38 billion years ago D) 4.02 billion years ago
Which of the following statements is FALSE?
a) Io has a noticeable lack of impact craters on its surface. b) All of the Jovian planets have a ring system. c) The surface of Europa is completely covered by water ice. d) Saturn has small and medium-sized moons, but no large ones. e) Water ice predominates on Saturn's moons.
How much would a paperclip made of neutron star material weigh on Earth?
A) about the same as an actual paperclip B) a few tons C) about as much as Mt. Everest D) about as much as the Moon E) about as much as the Sun