JEE Main 2020 — Structure Of Atom Question with Solution
From: JEE Main 2020 (Online) 2nd September Evening Slot
Question
The work function of sodium metal is
4.41 10–19 J. If photons of wavelength 300 nm
are incident on the metal, the kinetic energy of
the ejected electrons will be (h = 6.63 10–34 J s;
c = 3 108 m/s) ________ × 10–21 J.
Enter your answer
Show full solutionCorrect answer: 222
Correct answer
222
Step-by-step explanation
E = W + KEmax
KEmax = E - W
= - 4.41 10–19
= - 4.41 10–19
= 2.22 × 10–19 J
= 222 × 10–21 J
KEmax = E - W
= - 4.41 10–19
= - 4.41 10–19
= 2.22 × 10–19 J
= 222 × 10–21 J
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