Match the columns. List - I List - II (A) An oscillating LC circuit has frequency f and energy E . When the inductor has no current, it can suddenly be pulled or pushed to change its inductance. (P) I

Question

Match the columns.

List - I	List - II
(A) An oscillating LC circuit has frequency $f$ and energy $E$ . When the inductor has no current, it can suddenly be pulled or pushed to change its inductance.	(P) If $f$ increases, $E$ increases.
(B) Photons of frequency $f > f_{Th}$ are incident on a plate. $E$ is the maximum energy of liberated photoelectrons.	(Q) If $f$ increases, $E$ decreases.
(C) A block oscillates on a smooth surface with frequency $f$ and energy $E$ . When it is at instantaneous rest, mass can be removed or added to change its frequency.	(R) If $f$ decreases, $E$ increases.
(D) A string oscillates in its first harmonic, with frequency $f$ and energy $E$ . It can be pulled or relaxed to change its tension.	(S) If $f$ decreases, $E$ decreases.
	(T) If $f$ changes, $E$ remains the same.

TestHub · Accepted Answer

A: changing inductance at zero current leaves

$E = \frac{Q ^{2}}{2 C}$

unchanged B

$E = h f - ϕ$

increases with frequency C: changing mass at rest leaves

$E = \frac{1}{2} k A^{2}$

unchanged D: in the stated string model energy increases with frequency Mapping: A-T; B-P,S; C-T; D-P,S

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