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JEE Main 4 September 2020, Shift 1, Physics Q20

Question 20 of 75 in this shift, Physics question 20 of 25.

Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surface is : (Plancks constant h=

6.62\times10^{-34}

J.s)

The figure, in words

Graph with vertical axis Y labelled

V_{Stop}

(V) with an upward arrow, and horizontal axis X labelled

f

(

10^{14}

Hz) with a rightward arrow; the number 5 is printed at the origin end of the horizontal axis. A straight line rising to the right passes through three marked points: A at the axis intersection (at 5 on the horizontal axis), B labelled (5.5, 0), and C labelled (6, V), with a dashed horizontal line from C toward the vertical axis.

(1)2.10 eV
(2)1.93 eV
(3)2.27 eVOfficial answer
(4)2.59 eV

Official answer

Option 3

NTA final key (Sep 2020).

Chapter: Dual Nature of Radiation and Matter
Topic: Photoelectric Effect
Idea tested: Stopping Potential vs Frequency Graph

JEE Main 4 September 2020, Shift 1, Physics Q20

Same idea in other shifts