Physics, 09.03.2020 03:27 ooorozco

2 Points
Which of the following ideas provided an important step toward a more
complete understanding of blackbody radiation?

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Answer from: ellarsteers

Following ideas provided an important step toward a more complete understanding of blackbody radiation is given below

Explanation:

Planck wanted to understand black body radiation. The black body may be modeled by a box, with a small hole.We heat the box up, wait for the system to reach a stationary state (at a fixed temperature), and see what kind of electromagnetic radiation (intensity as a function of frequency) comes out of the hole. In , Rayleigh and Jeans3 tried to apply classical mechanics to this problem, and they calculated correctly that the black body would emit the electromagnetic radiation with a distribution of frequencies. However, the larger the frequency, the larger its intensity - an absurd conclusion, what is known as an ultraviolet catastrophe.All materials emit light. A tungsten metal wire can illuminate a room with black body radiation at 2800 K. Black body radiation is a combination of spontaneous and stimulated emission from an array of thermally excited oscillators. Planck‘s radiation law describing this phenomenon is considered to be the foundation for modern physics and quantum theory. While no material behaves exactly as a black body, all emit light by this mechanism. External energy in the form of heat enters the materials system, and light is emitted to maintain a steady-state, constant temperature.

Answer from: Quest

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

$p(t)=0.3t^2+6t+80$

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

so, our quadratic equation becomes,

$p(0)=0+0+80=80$

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

$p(t)=2\times 80=160$

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

$160=0.3t^2+6t+80\\\\160-80=0.3t^2+6t\\\\80=0.3t^2+6t\\\\0.3t^2+6t-80=0\\\\\text{using quadratic formula ,we get }\\\\t_{1,\: 2}=\frac{-60\pm \sqrt{60^2-4\cdot \: 3\cdot \: 800}}{2\cdot \: 3}\\\\t=-29.14\ and\ t=9.149$

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.

Answer from: Quest

the journeys of marquette, joliet and la salle a) new france expand.

all three of these explorers explored the midwest and the area around the great lakes, which they subsequently claimed for france.

this was a big portion of territory and expanded new france which before then only consisted of quebec province in northeastern canada

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Which of the following ideas provided an important step toward a more
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