Why do astronomers need different telescope designs to observe across the electromagnetic spectrum?
A) New telescopes incorporate new technology to increase their efficiency.
B) Telescopes have to adapt to the greater distortion of the atmosphere at shorter wavelengths.
C) Photons of different energy have different wavelengths, some of which are not accessible from Earth's surface and require different collection strategies.
D) Light pollution is worse at radio wavelengths than visible wavelengths.
E) Astronomers and engineers enjoy the challenge of making new telescope designs.
C
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According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
A) because the Sun's gravity was stronger in the outer solar system, allowing more solid material to collect B) because only metal and rock could condense in the inner solar system, while ice also condensed in the outer solar system C) because gas in the outer solar system contained a larger proportion of rock, metal, and hydrogen compounds than the gas in the inner solar system D) because only the outer planets captured hydrogen and helium gas from the solar nebula
If a dense 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment?
A. 24.5 N B. 49.0 N C. 69.3 N D. 98.0 N E. 139 N
A 1.7-m tall woman stands 8.0-m in front of a camera with a 5.0-cm focal length lens. What is the size of the image formed on film?
a. 23.5 cm b. 2.7 cm c. 1.1 cm d. 68.0 cm e. 0.37 cm
If you connect two identical bulbs to one battery in a series circuit instead of connecting the bulbs in parallel:
a. the first bulb will be brighter than the second one in the series circuit. b. each bulb is brighter in series than in parallel. c. each bulb is dimmer in series than in parallel. d. the bulbs glow just as brightly in series as in parallel. e. the battery lasts longer for the bulbs in parallel.