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

Physics & Space Science

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In general, sound is conducted fastest through

A) gases. B) liquids. C) solids. D) a vacuum.

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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.

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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.

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