Question

The value of the magnitude rounded off to the nearest integral power of 10 is called:
A. Significant figure
B. Uncertain number
C. Significant number
D. Order of magnitude

Answer 1

An order of magnitude is a scale class for any quantity in which each class has values that are proportional to the class before it. The quantity scaled is 10 in most cases, and the scale is the exponent applied to this amount (therefore, to be an order of magnitude greater is to be 10 times, or 10 to the power of 1, greater).

Complete answer:
Order of magnitude refers to a quantity's relative potency in terms of ten and nothing else. When a physical quantity is really large and communicating it is inconvenient, we apply the Principle of the Order of Magnitude to communicate such values.If the number is more than 5, the Power of 10 is multiplied by one. If it is less than one, the powers will remain the same.

As an example, $9192631770$ or $(9.192631770{\text{ }} \times {10^9})$ vibrations are created in cesium atoms. Although accurate measurement is critical, we occasionally refer to it as ${10^{10}}$ to minimise annoyance. Because the number exceeds 5, the power is enhanced by one.

So, the correct option is D.

Additional information: Orders of magnitude are commonly used to draw very rough comparisons and to represent really big differences. One number is about ten times greater than the other if they differ by one order of magnitude. They differ by a factor of around 100 if they differ by two orders of magnitude. The scale of two numbers of the same order of magnitude is essentially the same: the greater value is less than ten times that of the smaller value.

Note: In the realm of science, it is critical that estimations are at least in the ballpark. In many cases, an estimate that is within an order of magnitude of the value in question is sufficient. Although experienced scientists may find creating order-of-magnitude estimates simple and intuitive, less experienced scientists may find it utterly alien.