Carbon was used in Fermi's first nuclear reactor to
A) slow neutrons.
B) increase the speed of neutrons.
C) absorb neutrons.
D) none of the above
Answer: A
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In our best current theory, the first quasars formed about:
A) 14.5 billion years ago. B) 13 billion years ago. C) 12 billion years ago. D) 11 billion years ago. E) 9 billion years ago.
An 8000-kg aluminum flagpole 100-m high is heated by the Sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^?6 (°C)?1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g/°C.)
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The wave with the largest amplitude is
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above.
What wavelength corresponds to the n = 2 ? n = 1 transition in singly-ionized helium?
A) 15.2 nm B) 22.8 nm C) 4.56 nm D) 11.4 nm E) 30.4 nm