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Calculate the number of significant figu...

Calculate the number of significant figures in the following values.
a. Planck's constant '=6.626 xx 10^(34) Js'
b. Avogadro number '=6.023 xx 10^(23)'
c. Velocity of light '=3.0 xx 10^8 ms^(-1)'
d. Electronic charge '=1.602 xx 10^(-19) C'

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