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qna_english.md
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# Enem 2013 Question and Answers - English Translation
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## Question
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```
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It is common on airplane trips to be asked to
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turn off devices whose operation involves the emission
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or reception of electromagnetic waves, such as cell phones.
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The justification given for this procedure is, among other
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things, the need to eliminate sources of electromagnetic signals
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that might interfere with the pilots' radio communications
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with the control tower.
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This interference will only occur if the waves
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emitted by the cell phone and those received by the airplane's radio
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a) are both audible.
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b) have the same power.
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c) have the same frequency.
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d) have the same intensity.
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e) propagate at different speeds.
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```
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## Original Solution
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The contents have been translated into English for broader accessibility.
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```
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Solution:
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If the aircraft's communication equipment
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operates on the same frequency as cell phones,
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the phenomenon of interference between the
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radio frequencies used by these devices can occur.
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Answer: **C**
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```
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## Canarim-7B-VestibulAide Solution
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```
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For electromagnetic interference to occur in the airplane,
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there must be two electromagnetic waves with similar vibrations,
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but not identical, that is, there must be two waves with close frequencies.
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Correct Answer: **C**
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```
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