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Q1384737 Física

Supondo que ocorra uma transformação radioativa natural em dois estágios de um nuclídeo pai Imagem associada para resolução da questão para um nuclídeo filho Imagem associada para resolução da questão, assinale a alternativa que apresenta os decaimentos que possivelmente ocorreram nos dois estágios para essa transformação.

Alternativas
Q1384736 Física

A história da física nuclear teve início com a descoberta da radioatividade. A radioatividade envolve processos de desintegração espontânea de núcleos atômicos instáveis, sendo que cada tipo de emissão está associado a determinado tipo de estabilidade nuclear. No gráfico abaixo, que representa uma carta de nuclídeos, vê-se a representação de três transições nucleares (X → Y), em que as transformações nucleares convertem um núcleo pai X em um núcleo filho Y . Sobre as transições 1, 2 e 3, indicadas no gráfico Z( × )N , é correto afirmar que elas representam, respectivamente, os seguintes decaimentos:


Imagem associada para resolução da questão

Alternativas
Q1384735 Inglês

NASA’s Nuclear Frontier: The Plum Brook Reactor Facility


    There are three main types of nuclear reactors: power, research, and test. Research and test reactors as scientific tools are more common than most people realize. While power reactors frequently appear in newspaper headlines and are conspicuous because of their size and power, research reactors can be quietly tucked away, even in the midst of a college campus. Power reactors generate heat, which can easily be converted to other useable forms of energy, such as electricity. Research reactors operate at very low thermal power levels – so low, in fact, that they do not even require any type of forced cooling. They are used to measure nuclear parameters and other characteristics, which can then be used to build other reactors or to design experiments for test reactors. Test reactors are more powerful than research reactors and are able to produce much more intense radiation fields. Though they are still much less powerful than the power reactors, they generate enough heat to require a closed-loop forced-circulation coolant system. This system will remove the heat from the reactor by transferring it to a secondary cooling system, which releases it into the atmosphere through cooling towers.

NASA’s Nuclear Frontier: The Plum Brook Reactor Facility. Pages 36 to 40. 

Read the sentence below taken from the text.


Though they are still much less powerful than the power reactors, they generate enough heat to require a closed-loop forced-circulation coolant system.”


Choose the alternative that presents a word or expression that can susbtitute the bold and underlined one above, considering the context and without changing meaning.

Alternativas
Q1384734 Inglês

NASA’s Nuclear Frontier: The Plum Brook Reactor Facility


    There are three main types of nuclear reactors: power, research, and test. Research and test reactors as scientific tools are more common than most people realize. While power reactors frequently appear in newspaper headlines and are conspicuous because of their size and power, research reactors can be quietly tucked away, even in the midst of a college campus. Power reactors generate heat, which can easily be converted to other useable forms of energy, such as electricity. Research reactors operate at very low thermal power levels – so low, in fact, that they do not even require any type of forced cooling. They are used to measure nuclear parameters and other characteristics, which can then be used to build other reactors or to design experiments for test reactors. Test reactors are more powerful than research reactors and are able to produce much more intense radiation fields. Though they are still much less powerful than the power reactors, they generate enough heat to require a closed-loop forced-circulation coolant system. This system will remove the heat from the reactor by transferring it to a secondary cooling system, which releases it into the atmosphere through cooling towers.

NASA’s Nuclear Frontier: The Plum Brook Reactor Facility. Pages 36 to 40. 

Consider the words in bold and underlined in the following excerpts taken from the text.


I. “[...] power reactors frequently appear in newspaper headlines [...]”

II. “[...] research reactors can be quietly tucked away [...]”

III. “[...] which can easily be converted to other useable forms of energy [...]”


Choose the alternative in which the words in bold and underlined have the same grammar classification as the ones above. 

Alternativas
Q1384733 Inglês

NASA’s Nuclear Frontier: The Plum Brook Reactor Facility


    There are three main types of nuclear reactors: power, research, and test. Research and test reactors as scientific tools are more common than most people realize. While power reactors frequently appear in newspaper headlines and are conspicuous because of their size and power, research reactors can be quietly tucked away, even in the midst of a college campus. Power reactors generate heat, which can easily be converted to other useable forms of energy, such as electricity. Research reactors operate at very low thermal power levels – so low, in fact, that they do not even require any type of forced cooling. They are used to measure nuclear parameters and other characteristics, which can then be used to build other reactors or to design experiments for test reactors. Test reactors are more powerful than research reactors and are able to produce much more intense radiation fields. Though they are still much less powerful than the power reactors, they generate enough heat to require a closed-loop forced-circulation coolant system. This system will remove the heat from the reactor by transferring it to a secondary cooling system, which releases it into the atmosphere through cooling towers.

NASA’s Nuclear Frontier: The Plum Brook Reactor Facility. Pages 36 to 40. 

According to the text, the purpose of the closed-loop forced-circulation coolant system is to
Alternativas
Respostas
246: E
247: A
248: D
249: C
250: A