AT

Aditya TalwarAIR 270

Question 6GS1GS1

Rare earth Element

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AnswerStrengthsGapsKeywords

Introduction

Rare earth Element are 17 elements lanthanides that are commonly found in the earth but are difficult to find in high concentration for refining

24 words

  • Provides accurate definition of REEs as lanthanides
  • Identifies the key challenge (concentration for refining)

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Page 13

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Topper

Aditya Talwar

AIR 270

Subject & Paper

GS1GS1

Topic

Resource Distribution & Industries

Mineral Resources

Rare Earth Elements

Writing Stats

24

Total words

technical-descriptive

Tone

Linked PYQ

A small disc-shaped earth satellite, 1 m in diameter circles the earth (radius (625) km) at a distance of 300 km from the surface. The flat surface of the disc is oriented tangential to the earth's surface. The satellite surface has an emissive of 0.3 and is at -18°C. Calculate the net rate at which energy is leaving the satellite. Assume that : (i) The average earth surface temperature is 27°C and the Earth is black body. (ii) The satellite is in shadow of the earth and (iii) The part of the satellite surrounding not occupied by the earth is black and at O K. (iv) Stefan-Boltzimann constant = 5.67 x 10-8 W/m2-K4.

2017Calculate