The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, ???? 0 ν0 . Find the minimum energy

Question

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.

in progress 0
Khang Minh 2 months 2021-08-22T18:21:02+00:00 1 Answers 7 views 0

Answers ( )

    0
    2021-08-22T18:23:00+00:00

    Answer:

    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

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )