Ta có \(A = \dfrac{{hc}}{{{\lambda _0}}} = \dfrac{{6,{{625.10}^{ - 34}}{{.3.10}^8}}}{{0,{{26.10}^{ - 6}}}} = 7,{644.10^{ - 19}}J\)
\(A = \dfrac{{hc}}{{{\lambda _0}}}\)
Lấy đạo ln hai vế: \(\ln A = \ln (hc) - \ln {\lambda _0}\)
Lấy đạo hàm hai vế: \(\dfrac{{\Delta A}}{A} = \dfrac{{\Delta {\lambda _0}}}{{{\lambda _0}}}\\ \Rightarrow \Delta A = \dfrac{{\Delta {\lambda _0}}}{{{\lambda _0}}}.A\\ = \dfrac{{0,001}}{{0,26}}.7,{644.10^{ - 19}} = 0,{029.10^{ - 19}}J\)
Vậy \(A = 7,{644.10^{ - 19}} \pm 0,{029.10^{ - 19}}(J)\)
