How many moles of He would 3.01 × 10^23 helium atoms be?
a. 2.00
b. 4.00
c. 0.50
d. 1.00
e. None of these
c
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Imagine we've discovered a planet orbiting another star at an average distance of 1 AU with an orbital period of 6 months. The planet has a moon that orbits the planet at the same distance as our Moon, but it takes 2 months to complete an orbit. What can we infer about this planet?
A) It is more massive than Earth. B) It is less massive than Earth. C) It has the same mass as Earth. D) We cannot answer the question without knowing the mass of the star. E) We cannot answer the question without knowing the mass of the moon.
Which of the following is not a way light and matter interact?
A) emission B) scattering C) transmission D) absorption E) evaporation
The wavelength at which a blackbody radiates most depends on its:
A) radius. B) mass. C) magnetic fields. D) temperature. E) direction of motion.
When astronomers study the light emitted from the Sun they notice that the light emitted from the east limb (edge) is blueshifted while the light emitted from the west limb is redshifted. The reason for this is that
A. the Sun is rotating. B. the Sun contains different chemicals that emit different colors. C. the two opposing limbs have different surface temperatures. D. the distance between Earth and the Sun is constantly changing.