Which of two surfaces x and y has greater work function and why?
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(i) Einstein’s photoelectric equation
hν = φ+eV
V = hν/e + φ/e …(i)
Equation (i) represents a straight line given by line P andQ. φ/e represents negative intercept on the Y-axis. Since,Q has greater negative intercept, it will have greater φ (work function) and hence higher threshold frequency.
(ii) Also from
W = hv0 work function of Q is 6 x 1014 x 6.63 x 10-34
W = 3.9 x 10-19 unit WQ > WP
(iii) Emax = hv - φ0 = hv - hv0 = h(v-v0)
= 6.63 (8x1014 - 6x1014) J x 10-34J
= 1.33 x 10-19 J
Step-by-step explanation:
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