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19 March, 07:36

What is the work function of cadmium metal if light with = 9.85*1014hz is necessary to eject electrons?

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  1. 19 March, 08:05
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    We use the Planck’s formula:

    E = hv

    where,

    E = energy, h = planck’s constant = 6.6x10^-34 J s, v = frequency in Hz (Hz = 1 / s)

    Subsituting the values to find for E:

    E = (6.6*10^-34 J s) * 9.85*10^14 / s

    E = 6.5x10^-19 J
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