9. If a potential function of a diatomic molecule can be described by a Morse potential,
V(x) = , what is the force constant k?
(A)βDe
(B) 1/2βDe
(C) 1/2 β2De2
(D) 2 β2De2
8. A Fabry-Perot interferometer is assembled by two highly reflecting mirrors with a separation distance of 0.8 cm in air. The mirrors have the amplitude reflection coefficient of r = 0.932. A light source of 6400 wavelength illuminates the Fabry-Perot interferometer.