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  • The work function for caesium atom is 1.9 eV. Calculate (b) the threshold frequency of the radiation.

2.51    The work function for caesium atom is 1.9 eV. Calculate (b) the threshold frequency of the radiation.

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To find threshold frequency:

W_{o} = h\nu_{o}

Where

h = Planck’s constant

\nu_{o} = threshold frequency

\nu_{o}= \frac{W_{o}}{h}

\nu_{o} =\frac{ [1.9\times1.602\times10^{-19}J] }{[6.626\times10^{-34}Js]}

     = \frac {3.0438\times10^{-19}J} { 6.626\times10^{-34}Js}

     = 4.5937\times10^{14} Hz

Posted by

Divya Prakash Singh

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