Passage VI

Consider an electron that is constrained to move along the x-axis. The probability of finding the electron at any given location, x, along the axis is obtained from a distribu­tion function, DF, which is related to the electron's energy. The greater the value of DF at a given x, the greater the probability of finding the electron at that x. Classical theory and quantum theory can be used to derive 2 forms of DF: a classical form and a quantum form.

Table 1 lists the electron energy corresponding to each of 4 DFs. Figure 1 shows the classical and quantum forms of each DF.

40. At locations between -xmax and +xmax, the value of Classical DF is inversely proportional to the electron’s speed. Based on Table 1 and Figure 1, at which of the following locations is a 5 eV electron most likely moving fastest?

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

According to the inverse ratio between the Classical DF and the speed given in the question stem, the ordinate should be the smallest in the fastestest. Look at the DF3 diagram in figure 1 (see table 1, the electron energy corresponding to DF3 is 5 eV), the abscissa corresponding to the lowest point of the solid line should be 0< /p>