Compare and comment on the threshold energy values of a metal with a lower melting point (e.g. Al) and a metal with a very high melting point (e.g. W).
a) The threshold energy value for a metal with a lower melting point, such as Al, is typically lower than that of a metal with a very high melting point, such as W.
b) The threshold energy value for a metal with a lower melting point is generally easier to achieve compared to a metal with a very high melting point.
c) The threshold energy value for a metal with a very high melting point, like W, is significantly higher than that of a metal with a lower melting point, like Al.
d) The threshold energy value for a metal with a very high melting point indicates a stronger bond between its atoms compared to a metal with a lower melting point.