Question

Perform each of the following calculation the round off your answer to two digit a)1/3.40×10^24

Answer 1

Answer : The correct answer is, $2.9\times 10^{-25}$

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

Rules for significant figures:

Digits from 1 to 9 are always significant and have infinite number of significant figures.

All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures.

All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures.

All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures.

All zero’s after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures.

As we are given term:

$\frac{1}{3.40\times 10^{24}}$

By calculating the term, we get :

$\Rightarrow 2.94117\times 10^{-25}$

Now we have to round off the answer to two digit.

$\Rightarrow 2.9\times 10^{-25}$

Therefore, the correct answer in two digit is, $2.9\times 10^{-25}$

Answer 2

Answer:2.9 x10‐²⁵

Explanation:It is in the photo