Thin Lenses: A seed is 15 mm in front of a converging lens, and the image of the seed is 4.0 mm behind the lens. What is the focal length of the lens?
A. 11 mm
B. 5.5 mm
C. 3.8 mm
D. 3.2 mm
Answer: B
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Which of the following is not one of the three major strategies used to measure the mass of a galaxy cluster?
A) measuring the speeds of galaxies orbiting the cluster's center B) studying x-ray emission from hot gas inside the cluster C) observing how the cluster bends light from galaxies located behind it D) measuring the temperatures of stars in the halos of the galaxies
What is the origin of the jovian moons?
A) They all formed with the planet. B) They were main belt asteroids, captured by Jupiter's strong gravity. C) They are Trojan asteroids, orbiting 60 degrees ahead or behind Jupiter. D) The four Galilean moons formed with Jupiter, most others were later captures. E) They were ripped from the planet's interior in an early cataclysmic event.
Why do musical instruments sound different when playing the same note?
A. The frequency of the fundamental is different on different instruments B. The speed of sound is different in the two instruments C. Different musical instruments have different combinations of higher harmonics
The ozone layer causes a temperature increase in the
a. thermosphere. b. mesosphere. c. troposphere. d. stratosphere.