Kevin Nash
Last Activity: 10 Years ago
hc / λ1 – hc / λ0 = K.E. 1 ….(i)
And hc / λ2 – hc / λ0 = K.E.2 ….(ii)
⇒ hc / λ1 - hc / λ2 = K.E.1 – K.E2
⇒ hc [λ2 - λ1 / λ1 λ2] =K.E.1 – K.E2
∴ h = (K.E.1 – K.E.2)λ1 λ2 / c (λ2 – λ1)
= (1.8 – 4) x 1. 6 x 10-19 x 800 x 10-10 x 700 x 10-10 / 3 x 108 x (700 - 800) x 10-10
= 6.6 x 1034 J.s.