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JEE Main 20204 SeptemberMorning Shift
Exam
JEE Main
Year
2020
Date
4 September
Shift
Morning Shift
Subject
Physics
Chapter
Dual Nature of Matter

JEE Main 2020 · 4 September · Morning Shift · Physics · Dual Nature of Matter

Given figure shows few data points in a photo-electric effect...

Given figure shows few data points in a photo-electric effect experiment for a certain metal. The minimum energy for ejection of electrons from its surface is: (Planck's constant h=6.62×10–34J.sh = 6.62 \times {10}^{– 34}\text{J.s})

Given figure shows few data points in a photo-electric effect experiment for a certain metal. The minimum energy for

Options

  1. A2.27eV2.27\text{eV}
  2. B2.59eV2.59\text{eV}
  3. C1.93eV1.93\text{eV}
  4. D2.10eV2.10\text{eV}

Correct answer

A. 2.27eV2.27\text{eV}

Step-by-step solution

Given figure shows few data points in a photo-electric effect experiment for a certain metal. The minimum energy for

Threshold Energy =hv= hv

=6.62×10−34×5.5×1014J= 6 .62 \times {10}^{- 34} \times 5 .5 \times {10}^{14}J

Work friction =6.62×5.5×10−201.6×10−19eV= \dfrac{6 .62 \times 5 .5 \times {10}^{- 20}}{1 .6 \times {10}^{- 19}}eV

=2.27eV= 2 .27 eV

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