The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect?

The light is made of different types of photon, which have different energy content depending on their frequency. When the photon falls on the solar panel, it needs to provide electron enough energy to escape the attraction from the nucleus of the atom. Hence, the energy of the photon should be high. So, the light with higher frequency is need for photoelectric effect because higher the frequency, higher will be the energy of the photon and it will lead to photoelectric effect.

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

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.