The graph below shows how 100 atoms decay from a high energy state to a lower energy state. The graph shows how many atoms are still left in the high energy state as function of time. Without knowing more about atoms, use your knowledge of graphs to select the appropriate expression for this function.

Die onderstaande grafiek toon hoe 100 atome van 'n hoër na 'n laer energie toestand verval. Die grafiek wys hoeveel atome nog in die hoër energietoestand is as funksie van tyd. Sonder om meer te weet oor atome, gebruik jou kennis van grafieke om die mees toepaslike uitdrukking vir hierdie funksie te kies.