Problem

Problem

Ultraviolet radiation of 6.2 eV falls on an aluminium surface (work-function = 4.2 eV). The kinetic energy in joule of the fastest electrons emitted is a. 3.2×10−213.2 \times 10^{-21} b. 3.2×10−193.2 \times 10^{-19} c. 3.2×10−173.2 \times 10^{-17} d. 3.2×10−153.2 \times 10^{-15}

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