If a nuclide has a decay constant of 0.765 × 10-6 s-1 and contains 3.0 × 1017 nuclei
(a) what is the half life?
(b) what is its initial activity?
(c) what is the activity after 12. days?
(a) 9.06 × 105 s
(b) 2.3 × 1011 decays/s
(c) 1.0 × 1011 decays/s
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If a = 2.0 cm, b = 5.0 cm, and I = 20 A, what is the magnitude of the magnetic field at the point P?
A. 4.5 ?T B. 7.5 ?T C. 9.0 ?T D. 6.0 ?T E. 3.6 ?T
Which of the following is not evidence for the Big Bang?
A. The background of microwave radiation B. The expansion of the universe C. The ratio of hydrogen to helium observed in stars D. The existence of protons and neutrons
A point on the rim of a 0.30-m-radius rotating wheel has a tangential speed of 5.0 m/s. What is the tangential speed of a point 0.20 m from the center of the same wheel?
a. 1.0 m/s b. 0.50 m/s c. 3.3 m/s d. 17 m/s
Relativity equations for time, length and momentum hold true for
A) relativistic speeds. B) everyday low speeds. C) both of these D) neither of these