IGNOU BPHET 141 2026 - In a photoelectric effect experiment, it is seen that when light of wa

Question

In a photoelectric effect experiment, it is seen that when light of wavelength $180\text{ nm}$ is incident on a metal, the measured photoelectric current drops to zero at a potential $-1.00\text{ V}$ . Calculate the work function of the metal and its cut-off frequency for photoelectric effect.

19 Jan 2026

Answer :

Word Count : 185

The energy of incident photons is given by [ E = \frac{hc}{\lambda} ] Here, (h = 6.626 \times 10^{-34},\mathrm{Js}), (c = 3.00 \times 10^8,\mathrm{m/s}), and (\lambda = 180,\mathrm{nm} = 180 \times 10^{-9},\mathrm{m}). [ E = \frac{6.626 \times 10^{-34} \times 3.00 \times 10^8}{180 \times 10^{-9}} ] [ E = \frac{19.878 \times 10^{-26}}{180 \times 10^{-9}} = \frac{19.878 \times 10^{-26}}{1.8 \times 10^{-7}} ] [

_________ __________ _______ ___ _____.
________ _____ __________ _____ _________ __________ _______ __________ ____ ______ ______ ____.
______ ____ ____ __________ __________ ____ ____ ____ ________ _________.
____ ________ __________ _____ _____ __________ _____ ______ _________ ___.
________ ______ _____ _____ _________ ___ ___ ________ ________ _________ _________ _____.
_____ __________ _____ _______ ____ _____ ____ _______ ____.
________ ___ ___ ____ _______ ____ ____ ______ ____ _______.
___ ___ ______ __________ _______ ___ ___ ____ ____ _______ ____.
___ ___ __________ __________ _____ _______ ______ _________.
_____ ___ _________ _____ ______ ________ ______ ____.
__________ _____ ____ ______ ___ __________ ________ ____ ___ ________.
____ _________ ______ __________ ______ __________.
_______ ______ ________ __________ ______ _____.
_____ ________ _______ _________ _________ _____ _____.

IGNOU ACADEMY

Your IGNOU journey, made easier.

Solved Assignments
Study Notes
Guess Papers
Question Papers

Call Us WhatsApp

STUDY • PREPARE • SUCCEED

Skip in 10

IGNOU Solved Assignments Assignments Ignou Projects Project Previous Year Solved Exam Papers Notes Notes Sample Question Papers Sample Question Papers