Question

In a photoelectric effect experiment in which monochromatic light of wave- length, X, falls on a potassium surface, it is found the stopping potential is 1.91 V for λ-3000 and 0.88 V for λ-: 4000 Á. For these data, calcu- late: a) Planck's constant using e-1.69 × 10-19 C, b) the work function. W, for potassium, and c) the threshold frequency, vT for potassium.

Answer 1

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work t,anchor) e(1.9)-hceo. 176 фо -φο 、L-L)-he-ㄧ @cco e 1:^ 3000 xI6o :-eCo.gs) cㅡㅡ. case 2 _ e(l.ql-o.zs)_ hc L o ⓑ中 -19 ん 6· 70X10, 34