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RickyChen
Nice to see you again:)

You only need to convert the unit from nm to m.

So it will be:

5.2*10^4 * 10^-9 = 5.2*10^-5, which means 4 zeros before 52

Answer is C
The answer is C, 0.00052

10^-9 is equal to /10000000

So, 52000 / 10000000 = 0.000052

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