Question

Which number is written in scientific notation

Answer 1

A and B.
____________

Answer 2

Answer:

1) Option A - $4.5\times 10^{-3}$

2) Option B - $1.997\times 10^{2}$

Step-by-step explanation:

1) To find : Which number is written in scientific notation ?

Solution :

Scientific number is a way of writing very large or small numbers.

The notation is represented as one number before decimal times 10 to the powers.

From the options,

A) $4.5\times 10^{-3}$

B) $14.5\times 10^{2}$

C) $0.78\times 10^{-6}$

D) $5.7\times 4^{8}$

The correct way of writing number in scientific notation is $4.5\times 10^{-3}$

Therefore, Option A is correct.

2) To find : Which number is greatest ?

Solution :

The greater is the power of 10 the greater is the number.

From the options,

A) $2.89\times 10^{-8}$

B) $1.997\times 10^{2}$

C) $8.9\times 10^{-6}$

D) $0.5\times 10^{-6}$

The greater power is 2 rest all are negative so $1.997\times 10^{2}$ is greatest number.

Therefore, Option B is correct.