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Order of Magnitude

Write the ord...

Question

Write the order of magnitude of mass of an electron $9.1 \times 10^{- 31}$ kg.

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Solution

If mass of an electron is $9.11 X 10^{- 31} k g = 9.11 X 10^{- 28} g$

$1 k g = 1000 g$

Electrons in one kg would be = $\frac{1000}{9.11 X 10^{- 28}}$

= $\frac{1000}{9.11} X 10^{- 28}$

= $109.76 X 10^{28}$

= $1.0976 X 10^{30}$

= $10^{30}$

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