A typical television remote control emits radiation with a wave length of 940nm. What is the frequency (in s^-1) if this radiation? What type of electromagnetic radiation is this?

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium