Sample question to get accustomed to significant numbers.

Answer the following questions.
The answer is to be given to the appropriate significant figures.

a) 2.6 x 10 ^5 m + 2.1 x 10 ^ 3 km

b) The volume of the moon is 2.21x10^19 m2. What is the radius?

c) If there are 100 000 eletronic components on a semiconductor chip that measures 5.0 nm by 5.0 nm
     i) How much area does each component occupy?
     ii) If the individual components are square, how long is each on a side?

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