There are three. The 4, the 5 and the zero in between. The two last zeros serve only to properly space the decimal point which, in this number, is implied.
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Yes, 510 rounded off to 3 significant figures would be 510.
9, every number counts as a significant figure except leading zeroes and any zero without a different digit after it is not a significant figure unless there is a decimal point after it. i.e. 0500 has 1 significant digit, 501 has 3, and 500. has 3
The rule for significant figures is that all non-zero digits are considered significant. Zeros between non-zero digits are significant, as well as trailing zeros after a decimal point. Leading zeros (zeros to the left of the first non-zero digit) are not considered significant.
470 rounded to one significant figure is 500
500 nanometers is a unit of measurement commonly used to describe the wavelength of light. It falls within the visible spectrum of light and is equivalent to 0.0000005 meters.