Amonochromatic light beam with a quantum energy value of 4.3 ev is incident upon a photocell. the work function of the photocell is 2.2 ev. what is the maximum kinetic energy of the ejected electrons?

As per Einstein's Photo electric effect theory

the energy which incident in form of photon will be absorbed by the metal surface and some of the energy is released in form of KE of ejected electrons

now from the above equation

i would think it's food chain

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.