The first excited state of helium (he) is 159,850 cm-1 above the ground state. the first excited state of fluorine (f) is 404 cm-1 above the ground state. if we define the fraction of the atoms in the first excited state (fes) as latex: f_{\text{fes}}[\text{he or f}]f fes [ he or f ], which of the following statements is true at a temperature of 1000 k?

a) ƒfes [f] = 0
b) ƒfes [f] = 1
c) ƒfes [h] = 1
d) ƒfes [f] < ƒfes [h]
e) ƒfes [f] > ƒfes [h]

The grooves or folds of the brain are called

How many atoms are there in 5.70 mol of mg

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.