Which wavelengths are shortest?
A) light ray
B) X-ray
C) gamma ray
Answer: C
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Astronomers think the Milky Way has spiral arms because
A. globular clusters outline spiral arms. B. X-ray maps show that dust clouds are distributed in the disk with a spiral pattern. C. they can see them unwinding along the celestial equator. D. young star clusters, HII regions, and associations outline spiral arms. E. All of these choices are correct.
Radioactive decay is involved in
a. irradiating food to destroy harmful bacteria. b. keeping the interior of the Earth hot. c. making smoke detectors work. d. finding flaws in jet engine parts. e. all of the above.
An electron (m = 9.11 × 10^-31 kg) has a speed of 0.50 c. Determine the difference between its relativistic kinetic energy and the kinetic energy calculated without considering relativity
a. 3.0 × 10^-15 J b. 2.0 × 10^-15 J c. 1.5 × 10^-15 J d. 2.4 × 10^-15 J e. 1.8 × 10^-15 J
What does the spring constant k measure?
a. Period. b. Frequency. c. How much force it takes the string to stretch a given distance. d. How far the spring can be stretched before the stretch permanently deforms the spring. e. Amplitude.