Q152 · Practice questionComplex familiar1 mark
QUESTION 152
Monochromatic light has frequency below a clean metal's threshold frequency. Its intensity is increased tenfold while frequency remains constant. Within the usual one-photon photoelectric model, what occurs?
(A)
Electrons are emitted with ten times the maximum kinetic energy
(B)
Electrons are emitted after a tenfold shorter delay
(C)
The threshold frequency decreases
(D)
No photoelectrons are emitted
WORKED SOLUTION
1 markAnswer D
ANSWER
D. No photoelectrons are emitted
Worked solution
Each photon still has energy . Greater intensity supplies more sub-threshold photons, not more energy per photon. No emission occurs in the stated one-photon model.
Equivalent physically justified methods and consistent equivalent units accepted.
Displayed decimals are model answers; accept appropriate significant figures and consistent rounding from stated constants.
Select D.
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabus