What was an early clue that radioactivity was a nuclear, and not an atomic, effect?
a. It works without visible light.
b. It depended only on the amount of uranium, independent of its chemical form.
c. It seemed to be related to X rays.
d. It involved photon emission.
e. It had the same effect as light in exposing photographic plates.
b
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Based on Shapley's determination of the center of the galaxy, the Sun is located ____
a. in the galactic halo b. near the center of the galaxy c. at the edge of the galactic bulge d. in the middle portion of the galactic disk e. at the outer edge of the galactic disk
Sedna, with a perihelion three times farther out than Pluto, and a period of thousands of years, is just a typical Kuiper Belt body
Indicate whether the statement is true or false
An infinitely long nonconducting cylinder of radius R = 2.00 cm carries a uniform volume charge density of 18.0 µC/m3. Calculate the electric field at distance r = 1.00 cm from the axis of the cylinder. (?0 = 8.85 × 10-12 C2/N • m2)
A) 2.50 × 103 N/C B) 5.10 × 103 N/C C) zero D) 2.00 × 103 N/C E) 10.2 × 103 N/C
Most of Earth's fresh water is in
a. the atmosphere. b. lakes and rivers. c. glacial ice sheets. d. aquifers.