Radioactivity Basics: The atom 
Fr decays to 
Ra by emitting what kind of nuclear radiation?
A. alpha
B. beta-minus
C. beta-plus
D. gamma
E. x-rays
Answer: B
Physics & Space Science
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The full moon by definition occurs
a. for only a day. b. for 7-3/8 days. c. only for an instant. d. only once every month.
Physics & Space Science
In what part of spiral galaxies do new stars form?
A) In the bulge. B) In the spiral arms. C) No new stars are forming anywhere. D) In the halo. E) No new stars form inside spirals. They form outside the galaxy and are pulled in.
Physics & Space Science
A wave has a period 2.00 s, an amplitude 20.0 cm, and a wavelength 3.00 m. What is the speed of the wave?
A) 10.0 cm/s B) 1.50 m/s C) 340 m/s D) 0.100 cm/s E) 0.667 m/s
Physics & Space Science
The device that spreads light into its component colors in a spectroscope is a
A) prism. B) diffraction grating. C) either of these D) neither of these
Physics & Space Science