Question

Add 3.8 × 10⁻⁶ and 4.2 × 10⁻⁵ with due regards to significant figures.

Answer 1

Answer:

Explanation: the answers is given below :

Answer 2

Dear Student,

◆ Answer -

3.8×10⁻⁶ + 4.2×10⁻⁵ = 4.6×10⁻⁵

● Explanation -

Given are two numbers -

3.8 × 10⁻⁶ => 2 significant figures

4.2 × 10⁻⁵ => 2 significant figures

Therefore, answer should also be in 2 significant figures.

Now, addition will take place as -

3.8×10⁻⁶ + 4.2×10⁻⁵ = 0.38×10⁻⁵ + 4.2×10⁻⁵

3.8×10⁻⁶ + 4.2×10⁻⁵ = 4.58×10⁻⁵

But we need answer in 2 significant figures. So rounding it off,

3.8×10⁻⁶ + 4.2×10⁻⁵ = 4.6×10⁻⁵

Hope this helps you...