Question

If 3.8x10-6 is added to 4.2x10-5 giving due regard to significant figures,the result will be

Answer 1

Answer:

Sum of numbers,  $4.58\times 10^{-5}$

Explanation:

There are two numbers given i.e.

N₁ = 3.8 × 10⁻⁶

N₂ = 4.2 × 10⁻⁵

We have to add these two numbers and the answer must be in significant figures.

Significant figures are used to express a number with respect to its accuracy.

So, $N_1+N_2=3.8\times 10^{-6}+4.2\times 10^{-5}$

$N_1+N_2=0.0000458$

$N_1+N_2=4.58\times 10^{-5}$

There are three significant figure in the sum of two numbers. Hence, this is the required solution.

Answer 2

Answer:

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