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Half cubic meters of gold-sheet is extended by hammering so as to cover an area of 1 hectare.

What is the thickness of the gold sheet?

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0.004 cm

0.005 cm

0.001 cm

0.003 cm

answer is B.

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Detailed Solution

Given- half cubic meters of gold-sheet is extended by hammering so as to cover an area of 1 hectare.
To find- the thickness of the gold sheet.
Volume of gold plate

= 12 m 3

.
Area covered = 1 hectare

= 10, 000 m 2

.
Thickness of the gold

= V o l u m e A r e a

⇒ T h i c k n e s s = 0.5 10, 000 m ⇒ T h i c k n e s s = 5100000 m Sin c e, 1 m = 100 c m . ⇒ T h i c k n e s s = 5 × 100 100000 c m ⇒ T h i c k n e s s = 1200 c m ⇒ T h i c k n e s s = 0.005 c m

Thus, the thickness of the gold-sheet is 0.005 cm.
Hence, option 2 is the correct option.

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