In the experimental arrangement for study of photoelectric effect given below, P, Q, R and S, respectively are

(A) Commutator
(B) Evacuated Glass Tube
(C) Photosensitive Plate
(D) Quartz Window

Choose the correct answer from the options given below:

(D), (B), (A), (C)

The correct answer is Option (2) → (D), (B), (A), (C)

$\text{P: light enters through window} \Rightarrow \text{Quartz window}$

$\text{Q: outer enclosure} \Rightarrow \text{Evacuated glass tube}$

$\text{R: switching device} \Rightarrow \text{Commutator}$

$\text{S: emitting surface} \Rightarrow \text{Photosensitive plate}$

P = Quartz Window, Q = Evacuated Glass Tube, R = Commutator, S = Photosensitive Plate.