Which of the following include exact numbers?

(a) The speed of light in a vacuum is a physical constant; to six significant figures, it is 299792 x 108 rnis.

(b) The density of mercury at 25'C is 13.53 g/rriL.

(c) There are 3600 s in 1 h.

(d) In 2012, the United Slates had 50 stales

The correct answer is the option: (c) There are 3600 s in 1 h.

Explanation:

Hello!

Let's solve this!

We will analyze each of the options:

(a) The speed of light in a vacuum is a physical constant; to six significant figures, it is 299792 x 108 rnis: not an exact number.

(b) The density of mercury at 25'C is 13.53 g / rriL: not an exact number.

(c) There are 3600 s in 1 h: it is an exact number since in one hour there are 60 minutes and in one minute 60 seconds, so 60 * 60 = 3600s is an exact number.

(d) In 2012, the United Slates had 50 stales: not an exact number.

We conclude that the correct answer is the option: (c) There are 3600 s in 1 h.

The answer is C