Question

The radius of a Hydrogen atom is 0.0000000529177 of a millimeter express this number as an approximation.
A. 0.0000005
B. 0.00000005
C. 0.00000006
D. 0.0000000053
How many times is 4 x 10^4 larger than 2 x 10^2
A. 200
B. 20
C. 2
D. 2,000

Answer 1

The radius of a Hydrogen atom is approximately 0.00000005 mm, so the answer is B. 0.00000005.

To find out how many times 4 x 10^4 is larger than 2 x 10^2, we divide 4 x 10^4 by 2 x 10^2:
(4 x 10^4) / (2 x 10^2) = (4/2) x (10^4/10^2) = 2 x 10^2 = 200.

So, 4 x 10^4 is 200 times larger than 2 x 10^2. The answer is A. 200.