Two identical speakers emitting sound at 550 hz are d = 1.5 m apart. the point of total destructive interference closest to the speakers occurs at a point 4 m to the right and 0.8 m above the line of symmetry, which passes perpendicularly through the line joining the two speakers.
draw a diagram to scale and calculate the velocity of the sound waves using the pythagorean theorem to calculate distances exactly.
explain why the small-angle approximation for total destructive interference is d sin î¸ = (n + â½ ) î» where n is an integer.
use the small-angle approximation of part (b) to calculate the sound velocity. find the percentage difference from your answer in part (a).

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.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =