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Describe the measurement of Earth's shadow (umbra) radius during total lunar eclipse.

Answer» <html><body><p></p>Solution :(i) It is possible to measure the radius of shawdow of the Earth at the point where the Moon crosses. <br/> (ii) When the Moon is inside the umbra shadow, it appears red in <a href="https://interviewquestions.tuteehub.com/tag/colour-422259" style="font-weight:bold;" target="_blank" title="Click to know more about COLOUR">COLOUR</a>. As soon as the Moon exits from the umbra shadow, it appears in crescent shape. <br/> (<a href="https://interviewquestions.tuteehub.com/tag/iii-497983" style="font-weight:bold;" target="_blank" title="Click to know more about III">III</a>) By finding the apparent radii of the Earth's Umbra shadow and the Moon, the <a href="https://interviewquestions.tuteehub.com/tag/ratio-13379" style="font-weight:bold;" target="_blank" title="Click to know more about RATIO">RATIO</a> of the these radii can be <a href="https://interviewquestions.tuteehub.com/tag/calculated-907694" style="font-weight:bold;" target="_blank" title="Click to know more about CALCULATED">CALCULATED</a>. This is shown in figure.<br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/SUR_PHY_XI_V02_C06_E03_016_S01.png" width="80%"/> <br/> (iv) Schematic diagram of umbra disk radius. The apparent radius of Earth's umbra shadow = `R_(S) = 13.2 cm` <br/> The apparent radius of the Moon = `R_(m) = 5.15 cm` <br/> (v) The ratio `(R_s)/(R_m) = 2.56` <br/> The radius of the Earth's umbra shadow is <br/> `R_(s) = 2.56 xx R_(m)`.</body></html>


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