Which object has aged the most since it emitted the light we see today?
A) the Sun B) Pluto
C) a star near the center of the Milky Way D) a star in the Andromeda Galaxy
D
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What is the Prandtl number?
What will be an ideal response?
In general, sound is conducted fastest through
A) gases. B) liquids. C) solids. D) a vacuum.
When monochromatic X-rays are scattered by a material, the wavelength of the scattered radiation does not depend upon
A) the scattering angle. B) mass of the interacting particle. C) incident wavelength. D) the type of atom.
Suppose we imagine the Sun to be about the size of a grapefruit (about 10 cm across). Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a marble about 25 miles away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun. C) Earth is the size of a point about 1 meter away from the Sun. D) Earth is the size of a point about 15 meters away from the Sun. E) Earth is the size of a golf ball about 15 meters away from the Sun.