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 matter. What is the speed of this radiation in vacuum in m/s? Correct Answer 3 x 108

Speed of light is also the speed of all electromagnetic radiations. Speed of light is 3 x 108m/s.
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Interaction between matter and electromagnetic radiation can be observed by subjecting a substance to magnetic fields in which of the following manner?
Statement I Sound waves can travel through vacuum.
Statement II Light is an electromagnetic wave and can travel through vacuum.