Mass of a dust particle which is 0.0000000007 kg,in standard form it can be written as.
A
7×10−10
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B
7×10−9
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C
7×10−11
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D
7×10−8
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Solution
The correct option is A7×10−10 Given : Mass of dust particle=0.0000000007kg It can be written in standard form by moving from right most position to left most position where the point symbol starts and count the number of places it took to reach there. The number of places are '10'. 0.0000000007=71010 ∴0.0000000007=7×10−10