Standard California Smog Fee of $8.25 plus the dealer may not charge more than an additional $50. <br /><br /> From www.bar.ca.gov on 2/9/2010: <br /><b>How much does a Smog Check cost?</b><br /> Smog Check prices vary in different areas. Prices for Smog Checks are not regulated, so you are encouraged to shop around. For a list of stations in your area, visit the search page or call (800)952-5210. Standard California Smog Fee of $8.25 plus the dealer may not charge more than an additional $50. From www.bar.ca.gov on 2/9/2010: How much does a Smog Check cost? Smog Check prices vary in different areas.
The answer to the second question is no. No one can tell when a particular atom of a radioactive substance will decay. However, when we are dealing with large numbers of radioactive atoms we can predict how long it will take for a certain number or percentage of the atoms to decay. For each radioactive isotope, we can predict a certain half-life.
Calculating Radioactive Decay. At the level of single atoms, the decay process is random and spontaneous (in other words, it is not affected by the environment). However, for a large collection of atoms, the rate of decay is predictable. A common measure of the rate of radioactive decay is the half life, t Â½ . The half life is the time taken for half of the radionuclideâs atoms to decay. Another key measure is the decay time constant, t. The time constant is the inverse of the average lifespan of a radioactive particle.