JEE Main 2019 — Structure Of Atom Question with Solution
From: JEE Main 2019 (Online) 12th January Morning Slot
Question
What is the work function of the metal if the light of wavelength 4000 generates photoelectrons of velocity 6 105 ms–1 from it ?
(Mass of electron = 9 10–31 kg;
Velocity of light = 3 108 ms1
Plank's constant = 6.626 10–34 Js;
Charge of electron = 1.6 10–19 JeV–1)
(Mass of electron = 9 10–31 kg;
Velocity of light = 3 108 ms1
Plank's constant = 6.626 10–34 Js;
Charge of electron = 1.6 10–19 JeV–1)
Choose an option
Show full solutionCorrect option: C
Correct answer
C2.1 eV
Step-by-step explanation
E = + K.E
h = +
=
=
= 3.35 10-19 J
= eV
= 2.0934 eV 2.1 eV
h = +
=
=
= 3.35 10-19 J
= eV
= 2.0934 eV 2.1 eV
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