Light of frequency 1.5 times the threshold frequency

Question :- A light of frequency 1.5 times the threshold frequency is incident on photo-sensitive material. If the frequency is halved and intensity is doubled, the photoelectric current becomes

(A) quadrupled

(B) doubled

(C) halved

(D) zero

Solution :- Given that light of frequency 1.5 times the threshold frequency is incident on photo-sensitive material. So photoelectrons are being ejected from the material. But after that frequency is halved (= 1.5v₀/2 = 0.75v₀) and intensity is doubled. Since frequency is now 0.75v₀ < v₀ i.e., less than threshold frequency hence ejection of photoelectrons stops. So correct option is (D).