Inexpensive metals are often covered with a thin layer or gold or silver to make jewelry less expensive. What is the most likely process used to produce this jewelry?

14 days is the half-life of phosphorus-32

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.