The transmission coefficient swings between its maximum of 1 and minimum of [ 1 + V 0 2 4 E ( E − − V 0 ) ] − − 1 as a function of the length of square well ( L ) with a period of π π k 2 . The minima of the transmission tend to 1 in the limit of large energy E >> V 0 , resulting in more shallow resonances, and inversely tend to 0 in the limit of low energy E << V 0 , resulting in sharper resonances. This is demonstrated in plots of transmission coefficient against incident particle energy for fixed values of the shape factor, defined as 2 m V 0 L 2 ℏ ℏ 2