The coefficient of linear expansion of copper is 17 × 10-6 K-1. A block of copper 30 cm wide, 45 cm long, and 10 cm thick is heated from 0°C to 100°C What is the change in the volume of the block?
A) 2.3 × 10-5 m3
B) 6.9 × 10-5 m3
C) 5.2 × 10-5 m3
D) 4.6 × 10-5 m3
E) 14 × 10-5 m3
B
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Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.80 eV
What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 8.7 × 10-19 J B) 3.1 × 10-19 J C) 1.3 × 10-19 J D) 2.4 × 10-19 J E) 4.5 × 10-19 J
Today, the uranium found on Earth contains 0.720% 235U (with a half-life of 0.700 billion years) and 99.28% 238U (with a half-life of 4.50 billion years)
At a time 2.20 billion years ago, what percent of the uranium on Earth was 238U (assuming that no other uranium isotopes were present)? A) 95.6% B) 2.18% C) 6.29% D) 8.68% E) 4.53%
The source of electrons in a simple electric circuit is
A) the voltage source. B) energy stored in the voltage source. C) energy released by the voltage source. D) the electrical circuit itself. E) none of the above
The quantum numbers of electrons on an atom include the principal quantum number, the angular-momentum quantum number, the magnetic quantum number, and the ______________quantum number of +/–1/2.
Fill in the blank(s) with the appropriate word(s).