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Question

Amit wants a box which can absorb the heat from the sun very quickly but lose it very slowly. How should outer and the inner surface of the box be coloured so that he gets the best result?

अमित को एक बक्से की आवश्यकता है, जो सूर्य से आने वाली ऊष्मा का बहुत शीघ्रता से अवशोषण कर सके, लेकिन इसे बहुत धीरे-धीरे उत्सर्जित करे। बक्से के बाह्य तथा आन्तरिक पृष्ठ को किस प्रकार रंगा जाना चाहिए ताकि उसे सबसे अच्छा परिणाम प्राप्त हो?

A
Outer – Black, Inner – Black

बाहर – काला, अन्दर – काला
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B
Outer – Black, Inner – Silver

बाहर – काला, अन्दर – सिल्वर
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C
Outer – Silver, Inner – Black

बाहर – सिल्वर, अन्दर – काला
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D
Outer – Silver, Inner – Silver

बाहर – सिल्वर, अन्दर – सिल्वर
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Solution

The correct option is B Outer – Black, Inner – Silver

बाहर – काला, अन्दर – सिल्वर
Solution

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