Q15 · 2025 · Paper 1Complex familiar1 mark
QUESTION 15
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 graph for metal X has a theoretical gradient equivalent to
(A)
6.6 × 10−34 J s
(B)
1.3 × 10−19 J
(C)
6.7 × 10−1 J Hz−1
(D)
2.0 × 1014 Hz
WORKED SOLUTION
1 markAnswer A
ANSWER
A
Worked solution
From the photoelectric equation , a graph of maximum kinetic energy against frequency has gradient J s. Option A.
Selects option A.
Worked explanation by QCE Vault; correct option verified against the QCAA answer key.