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Why are two thin blankets are warmer tha...

Why are two thin blankets are warmer than a single blanket of double the thickness?

A

their surface area increases

B

a layer of air is formed between these two blankets which is bad conductor

C

these have more wool

D

they absorb more heat from outside

Text Solution

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The correct Answer is:
B
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DC PANDEY ENGLISH-CALORIMETRY AND HEAT TRANSFER-Check points 16.4
  1. Ice formed over lakes has

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  2. Air is bad conductor of heat or partly conducts heat, still vacuum is ...

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  3. Why are two thin blankets are warmer than a single blanket of double t...

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  4. One likes to sit under sunshine in winter seasons, because

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  5. A hot and a cold body are kept in vacuum separated from each other. Wh...

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  6. A body, which emits radiations of all possible wavelengths, is known a...

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  7. Distribution of energy in the spectrum of a black body can be correctl...

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  8. Which of the following law states that "good absorbers of heat are goo...

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  9. The ratio of the Emissive power to the absorption power of all substan...

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  10. If between wavelength lambda andlambda + dlambda, e(lambda) and a(lamb...

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  11. There is a black spot on a body. If the body is heated and carried in ...

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  12. In MKS system, Stefan's constant is denoted by sigma. In CGS system mu...

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  13. A black body radiates 20 W at temperature 227^(@)C. If temperature of ...

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  14. Two spherical black bodies of radii R(1) and R(2) and with surface tem...

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  15. A sphere has a surface area of 1.0 m^(2) and a temperature of 400 K an...

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  16. Two spheres of the same material have radii 1m and 4m and temperatures...

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  17. The area of a hole of heat furnace is 10^(-4)m^(2). It radiates 1.58xx...

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  18. If a body cools down from 80^(@) Cto 60^(@) C in 10 min when the tempe...

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  19. A block of metal is heated to a temperature much higher than the room ...

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  20. If wavelengths of maximum intensity of radiations emitted by the sun a...

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