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Reading Comprehension - Worked Examples

Current time:0:00Total duration:4:07

Inferences about info | Science passage | The Sun

Reading Comprehension - Worked Examples

Video transcript

which one of the following statements about spectroscopy is most strongly supported by the information in the passage okay so this is strongly supported by the information in the passage we can use the passage and look around for it hopefully we have some idea about how spectrography was mentioned it seemed like a pretty valid thing that the data was misinterpreted at one point to think that you know the iron was to prevent was a major element in the sign and then we know about sir spectroscopy that cecilia payne reinterpreted that data to find that hydrogen and helium were the predominant elements in the Sun okay so let's look at these choices it's used during the 1920s was generally confined to the field of astronomy I'm not sure that was mentioned shouldn't you know lead to a conclusion about that I'm not really liking that choice kid yielded data about the sun's composition that pain initially doubted but also really came to accept well yielded data well did she doubt the data I'm interested in this this choice a little bit I may leave it in for now but we don't really know that she initially doubted the data I mean she believes the data she's a scientist it's the interpretation of the data there were they were kind of wondering about so let's um let's keep looking it played a crucial though often unacknowledged role in the emergence of our present-day understanding of the process of nuclear fusion we don't know if it's unacknowledged that seems like a reach I'm not really liking that choice just because of this we don't really hear about that in the passage so I'm going to move on D it was regarded by certain prominent scientists in 1920s at an unproven tool that produced data of often questionable reliability no we don't really hear of any prominent Sciences of the 20s doubting the data calling it unproven calling it crystalline reliability that is definitely not mentioned D is out e it was a technique advanced enough by the 1920s to detect the presence in the sun's of elements that constitute it considerably less than ten percent of its mass okay well maybe that's there I'm not kind of like that as well I'm going to go back to the passage in a second to look okay this is pretty specific and if we learned ultimately that there are trace elements and they knew that there are other things in there let's let's look for doubt that that could be right but let's also we don't know this generally confined in the field of astronomy I'm not really looking for depth for evidence for a and we are and we're also looking for his whether pain actually initially doubted the data about the sun's composition she did she doubted the interpretation of that data whether she doubted the data that connection makes me really not like B okay so we're going back up and we're going to look for whether or not the spectroscopy was able to to to detect the presence of things that were kind of trace elements in the Sun so let's head up and see what we can find if you have a percentage here that number kind of like points us in the right direction let's see you know whether we can find something we need here okay she analyzed without preconception she found the data it could be consistently read as indicating that while it doesn't D contains iron along with the other elements Sun and Earth ninety percent of the Sun is hydrogen and most of the remainder is helium okay so if ninety percent we now know is hydrogen and most the remainder is helium and if the data tells us that it does indeed contain iron okay that means that this iron must be less than ten percent okay so that's that's that's pointing in the right direction to how to answer this question just about there's a technique advanced enough by the 1920s to detect the presence in the Sun elements that constitute considerably less okay so they detected detected iron and iron turned out not to be even ten percent of the mass of the Sun this is definitely our answer