The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. What will be the initial decay rate, at t = 0 (in decays/s)?
a. 1.09 × 10^14
b. 1.8 × 10^-9
c. 5.6 × 10^8
d. 3.6 × 10^18
e. 3.6 × 10^17
D
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What will be an ideal response?
Radiation Doses: The maximum permissible workday dose for occupational exposure to radiation is 11 mrem. A 77-kg laboratory technician absorbs 2.3 mJ of 0.5-MeV gamma rays in a work day. The relative biological effectiveness (RBE) for gamma rays is 1.00. What is the number of gamma-ray photons absorbed by the technician in a workday?
A. 3 × 1010 B. 3 × 109 C. 3 × 108 D. 1 × 109 E. 1 × 108
A system may
a. be isolated. b. have real boundaries. c. have imaginary boundaries. d. all of these
Consider the equipotential diagram shown in problem E3T.12. In the expression 
, what is the approximate value of b?
A. 8
B. 2
C. 0
D. 1/2
E. 1/8
F. Some other value (specify)