Physics, asked by kriti92, 1 year ago

answer is 3rd but please give me the reason

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Answered by jenny86

the answer which has highway number of significant numbers is most accurate. in this question answer (3) has 3 significant numbers so it is more accurate. while answer (1) has 2 , (2) has 1 and (4) has 1 significa figure.

kriti92: all have same no of significant figures

jenny86: no

jenny86: 3rd answer has 3 significant numbers

jenny86: while answer 1,2 and 4 th answer contain 2,1 and 1 significant fig respectively

kriti92: all have one significant figures

jenny86: no you are wrong

kriti92: 400. has 3 significant figures

kriti92: but 40o have 1

jenny86: ans 1 has 2 no. so it has 2 sig. fig. , similarly ans 2 has 1 no. after point and 0 so it has 1 sig. fig. and similar for ans 4

jenny86: no 40 has 2 sig. fig.

Answered by lidaralbany

Answer:

Option 4 is correct. $4\times10^{1}m$ .

Explanation:

According to scientific notation

Scientific notation: a number and multiply by power of 10.

$\Rightarrow k\times 10^n$

where 0<k<10 and n is an integer.

Option 1, 2 and 3 are not in scientific notation. So they are not accurate.

So, $4\times10^{1}m$ is accurate measurement.

Hence, the correct answer is $4\times10^{1}m$ .

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