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6 May, 12:17

The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency,? 0 ν0. Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 4.23 * 10 14 s1. 4.23*1014 s-1.

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  1. 6 May, 12:40
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    E = 2.8028*10⁻¹⁹ Joules

    Explanation:

    The minimum energy needed to eject electrons from a metal with a threshold frequency fo is expressed as E = hfo

    h = planck's constant

    fo = threshold frequency

    Given the threshold frequency fo = 4.23*10¹⁴ s⁻¹

    h = 6.626 * 10⁻³⁴ m² kg / s

    Substituting this value into the formula to get the energy E

    E = 4.23*10¹⁴ * 6.626 * 10⁻³⁴

    E = 28.028*10¹⁴⁻³⁴

    E = 28.028*10⁻²⁰

    E = 2.8028*10⁻¹⁹ Joules
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