Compare the peak wavelength of the radiation in the universe at the end of the era of nucleosynthesis with the peak wavelength of the radiation in the universe currently. Assume the temperature at the end of the era of nucleosynthesis was 10^9 K. The current temperature in space is 2.73 K. By what factor have the wavelengths of the photons in the universe been stretched since that time? Hint: Use Wien's law to get the peak wavelengths then and now. Then, take the ratio of the peak wavelengths.

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.

the doppler effect is used by weather forecasters to measure 

moving clouds