The Earth's magnetic field was flipped by 180 | vedclass

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(B) The total change in orientation is $180^{\circ}$.Given that the duration of the flip is $10^5 \, 	ext{years}$.The average change in orientation p

Vedclass · Accepted Answer

$5$

Vedclass · Answer

(B) The total change in orientation is $180^{\circ}$.Given that the duration of the flip is $10^5 \, 	ext{years}$.The average change in orientation per year in degrees is $\frac{180^{\circ}}{10^5} = 1.8 	imes 10^{-3} \, ^{\circ}/	ext{year}$.We know that $1^{\circ} = 60 \, 	ext{minutes}$ and $1 \, 	ext{minute} = 60 \, 	ext{seconds}$, so $1^{\circ} = 3600 \, 	ext{seconds}$.Therefore, the average change in orientation per year in seconds is $1.8 	imes 10^{-3} 	imes 3600 \, 	ext{s/year} = 6.48 \, 	ext{s/year}$.Comparing this value with the given options, it is closest to $5 \, 	ext{s}$.

The Earth's magnetic field was flipped by $180^{\circ}$ a million years ago. This flip was relatively rapid and took $10^5 \, \text{years}$. Then, the average change in orientation per year during the flip was closest to ............ $s$.

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