Question

how will you show with the help of an experiment that copper is more reactive than silver

Answer 1

Cu+AgCl In this reaction Cu will displace Ag which shows that Cu is more reactive.

Answer 2

Take silver nitrite in a test tube. Add copper pieces and keep it undisturbed.
Later, the solution turns blueish. And silver is seen to precipitate. Copper has displaced silver and hence, is more reactive.

Cu + $2AgNO_{3}$= $Cu(NO_{3})_{2}$ + Ag