Question: 100% NCERT covered from Particular Keyword.Explanations are 100% from NCERT | [Difficult level: Easy] From NCERT NEET Derived Question.
In photoelectric effect, electrons are ejected from metals,
if the incident light has a certain minimum
(a) wavelength (b) frequency
(c) amplitude (d) angle of incidence
Answer: (b) The minimum frequency above which the electrons
are ejected from the metal surface, is called the
threshold frequency for that metal. No electrons are
emitted if the frequency of the incident light is less
than the threshold frequency
