Q16 · 2025 · Paper 1Complex familiar1 mark
QUESTION 16
Questions 15–16 refer to the following scenario. Researchers conducted a photoelectric effect experiment in which light was shone on two unknown metals, R and X. The results were analysed to produce the graph shown.
The work function for metal R is
(A)
zero.
(B)
less than metal X.
(C)
equal to metal X.
(D)
greater than metal X.
WORKED SOLUTION
1 markAnswer B
ANSWER
B
Worked solution
The work function is , so it is proportional to the threshold frequency (the x-intercept). Metal R has the lower threshold frequency, so it has the smaller work function. Option B.
Selects option B.
Worked explanation by QCE Vault; correct option verified against the QCAA answer key.