The isotopecadmium-124*undergoes gamma decay. Write the reaction equation, and determine the identity of the daughter nucleus.

a) 124/48 Cd* 124/47 Ag +

b )124/48 Cd* 125/49 In +

c) 124/48 Cd* 125/48 Cd +

d)124/48 Cd* 124/49 In +

e) 124/48 Cd* 124/48 Cd +

A Geiger counter registers a count rate of 7,600 counts per minute from a sample of a radioisotope. Four minutes later, the count rate is 1,900 counts per minute. What is the half-life of the radioisotope?

min

An accident in a laboratory results in a room being contaminated by a radioisotope with a half-life of 8 days. If the radiation is measured to be eight times the maximum permissible level, how much time must elapse before the room is safe to enter?

days

When the plutonium bomb was tested in New Mexico in 1945, approximately 1 gram of matter was converted into energy. Suppose another bomb is tested, and 1.6 grams of matter are converted into energy. How many joules of energy are released by the explosion? J