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1.If the half life of a specific radioisotope is 5.7 days, how much activity would remain after 41 days?

2. Smoke detectors used in homes use americium-241, which undergoes alpha decay. When these alpha particles collide with air molecules, charged particles are produced that generate an electrical current. If smoke particles enter the detector they interfere with the formation of charged particles in the air, and the electrical current is interrupted, which causes the alarm to go off and beep. Write balanced nuclear equation for the alpha decay of americium-241.

3. The amount of radioactive phosphorus-32 (P-32) used to treat leukemia decreases from 1.45 mg to 0.36 mg in 29 days. Determine the half-life of P-32.

4. A specific element has a half-life of thirteen million years. You find a rock that has 6.25% of this particular element remaining in it. Determine how old the rock is.

5. A piece of ice at 0 degrees C and weighing 52 g is added to a beaker of water at 17 degrees C. All the ice melts, and the temperature of the water decreases to 8 degrees C.

How many grams of water were in the beaker?

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