Q20 · 2021 · Paper 1Simple familiar1 mark
QUESTION 20
A photoelectron with a kinetic energy of 2.5 × 10–19 J is ejected when a photon with a frequency of 1.3 × 1015 Hz is incident on the metal plate. Calculate the threshold frequency of light required to eject the photoelectron from the metal plate.
(A)
6.1 × 10–19 Hz
(B)
3.7 × 1014 Hz
(C)
9.2 × 1014 Hz
(D)
1.7 × 1015 Hz
WORKED SOLUTION
1 markAnswer C
ANSWER
C
Worked solution
From and , Hz. Option C.
Selects option C.
Worked explanation by QCE Vault; correct option verified against the QCAA answer key.