Which wavelengths are shortest?

A) light ray
B) X-ray
C) gamma ray


Answer: C

Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science