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Dual Nature of Radiation and Matter

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Modern Physics

Dual Nature of Radiation and Matter
Atoms
Nuclei
Semiconductor Electronics : Materials, Devices and Simple Circuits
  1. Ultraviolet radiations of 6.2 eV falls on an aluminium surface. K.E. of fastest electron emitted is (work function = 4.2 eV)
    1. 3.2 × 10–21 J ​
    2. 3.2 × 10–19 J ​
    3. ​7 × 10–25 J
    4. 9 × 10–32 J
Correct Option: B

K.E. of fastest electron
= E – W0 = 6.2 – 4.2 = 2.0 eV ​
= 2 × 1.6 × 10–19 = 3.2 × 10–19 J


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