Fluorescence occurs when a high energy photon pumps a molecule up to an excited energy level. The molecule then decays to a level partway down by emitting another photon. Suppose we pump up a molecule with the three energy levels indicated from level E0 to level E2 using a 395 nm photon. The intermediate level, E1, has an energy 0.7 eV about the ground state, E0. What is the wavelength of the fluorescent photon emitted when the molecule decays from level E2 to level E0

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

option number c is the right answer.

ya te mando la respuesta