First slide

Plancks Quantum theory, Black body radiations

Question

Energy of a photon is 1.5 eV/atom. The wavelength of the photon is equal to

Moderate

A

8266nm
B

82.66nm
C

82660nm
D

826.6nm

Solution

$E = \frac{hC}{λ}; E = 1.5 ev / atom; 1.5 \times 1.602 \times 10^{- 19} J = \frac{6.625 \times 10^{- 34} J \times 3 \times 10^{8} m / s}{λ}; λ = 8.26 \times 10^{- 7} m = 826.6 nm; or λ (nm) = \frac{1240}{E (ev / atom)}$

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