Spectroscopy deals with interaction of electromagnetic radiation with matter. What is the speed of this radiation in vacuum in m/s?

Spectroscopy deals with interaction of electromagnetic radiation with

1.	Spectroscopy deals with interaction of electromagnetic radiation with matter. What is the speed of this radiation in vacuum in m/s?
A.	6 x 10<sup>8</sup>
B.	5 x 10<sup>8</sup>
C.	7 x 10<sup>8</sup>
D.	3 x 10<sup>8</sup>
Answer» E.